Inclined-leg rigid frame temporary bridge with foundation pit supporting function

Abstract

The utility model provides an inclined-leg rigid frame temporary bridge with a foundation pit supporting function. The inclined-leg rigid frame temporary bridge comprises longitudinal beams and inclined legs. The two ends of the longitudinal beam are fixedly connected with top beams at the top ends of fender posts on the two sides of a foundation pit correspondingly. The ends, away from each other, of the pair of inclined legs extend towards the two sides of the foundation pit correspondingly, and inclined leg foundations fixedly connected with the inclined legs are further arranged on the surface sides of the fender posts located on the extending paths of the inclined legs. The temporary bridge is of an inclined-legged rigid frame structure, the first span crosses over the foundation pit, no pier column is arranged, the temporary bridge is directly supported on a foundation pit fender post and a top beam, an inner supporting structure of the foundation pit and the temporary temporary bridge for ground traffic are combined into a whole, and the supporting structure of the foundation pit is fully utilized. The structure is not only a supporting structure in the foundation pit, but also a temporary bridge for bearing ground traffic; on the premise that smooth ground traffic is met, construction of the foundation pit and the main body structure is not affected. Meanwhile, the structure is prefabricated in an assembly mode, in the foundation pit construction process, the structure is directly hoisted in place, the construction period is greatly shortened, and meanwhile the overall construction quality of assembly type components is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to rail transit technical field, concretely relates to a kind of inclined leg rigid frame temporary bridge with foundation pit support function. BACKGROUND

[0002] For the consideration of improving public transport convenience, adapting construction condition, realizing traffic connection, optimizing urban space layout and other factors, urban rail transit station is mostly arranged below traffic busy road;Among them, open-cut station is most common.

[0003] In station open-cut construction, foundation pit excavation will lead to road traffic interruption, and temporary diversion of ground traffic is needed. But in the case of increasing urban construction density, there are many structures around the station, and most of the open-cut stations do not have the condition of long-term traffic diversion, so temporary bridge is needed to ensure the smoothness of ground traffic. But the traditional open-cut foundation pit temporary bridge cannot fully utilize the foundation pit support structure, the construction period is long, and there are mutual restrictions in space and stress between foundation pit and temporary bridge, and there are cross operations between foundation pit excavation support and temporary bridge construction. SUMMARY

[0004] In view of the defects in the prior art, the inclined leg rigid frame temporary bridge with foundation pit support function provided by the utility model solves at least the technical problem that the existing open-cut foundation pit temporary bridge cannot fully utilize the foundation pit support structure.

[0005] In order to achieve the above purpose, the utility model realizes the following technical scheme:

[0006] An inclined leg rigid frame temporary bridge with foundation pit support function comprises longitudinal beams for laying bridge deck slabs and inclined legs for supporting the longitudinal beams. The two ends of the longitudinal beams are respectively fixedly connected with the top beam of the retaining piles on both sides of the foundation pit. At least one pair of inclined legs is arranged below the longitudinal beams. The distal ends of the two pairs of inclined legs respectively extend towards the two sides of the foundation pit. Inclined leg foundations are arranged on the surface side of the retaining piles along the extension path of the inclined legs. The inclined leg foundations are fixedly connected with the corresponding inclined legs. The side of the top beam away from the foundation pit is provided with a retaining wall. The top end of the retaining wall is flush with the initial excavation line of the foundation pit. The end of the longitudinal beam is fixedly connected with the corresponding top beam and retaining wall.

[0007] Optionally, the inclined leg rigid frame temporary bridge further comprises a traction anchor cable. One end of the traction anchor cable is anchored towards the end of the inclined leg away from the longitudinal beam. The other end of the traction anchor cable penetrates the inclined leg and is embedded in the inclined leg foundation.

[0008] Optionally, the retaining piles along the extension path of the inclined legs are provided with grooves on the side towards the foundation pit. The end of the inclined leg foundation away from the foundation pit is embedded in the groove.

[0009] Optionally, each of the two side walls of the groove is provided with a first through hole penetrating the retaining pile, and the oblique leg foundation is provided with a second through hole corresponding to the first through hole at one end embedded in the groove, so as to facilitate the fixation of the oblique leg foundation and the corresponding retaining pile by the insertion rod.

[0010] Optionally, the traction anchor cable is inserted into the oblique leg foundation and is inserted with the insertion rod through the rigging grommet or carabiner.

[0011] Optionally, the oblique leg foundation is provided with an open slot for accommodating the rigging grommet or carabiner on the side away from the oblique leg, and the second through hole is in communication with the open slot.

[0012] Optionally, the oblique leg comprises a plurality of sequentially connected steel segment sections, and each of the two ends of the steel segment section is provided with a connecting plate.

[0013] From the above technical solution, the beneficial effects of the utility model are:

[0014] The oblique leg rigid frame temporary bridge provided by the application has the advantages that: the oblique leg rigid frame temporary bridge has the functions of supporting the foundation pit and the functions of the temporary bridge, and the oblique leg rigid frame temporary bridge is directly supported on the retaining piles and the crown beams of the foundation pit, so that the inner support structure of the foundation pit and the temporary bridge for ground traffic are combined, and the foundation pit support structure is fully utilized; the structure is the inner support structure of the foundation pit and the temporary bridge for ground traffic; the structure does not affect the construction of the foundation pit and the main structure under the premise of meeting the smooth traffic of the ground traffic; meanwhile, the structure is assembled and prefabricated, and is directly hoisted and positioned in the construction process of the foundation pit, so that the construction period is greatly shortened, and the overall construction quality of the assembled components is better. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the utility model, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally indicated by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0016] Figure 1 It is a sectional view of the oblique leg rigid frame temporary bridge with the function of supporting the foundation pit.

[0017] Figure 2 Fig. 2 is a perspective view of a retaining pile according to the present application; Figure 1 Fig. 3 is an enlarged view of the portion A in Fig. 2;

[0018] Figure 3 Fig. 4 is an assembly view of the installation of a batter leg foundation on a retaining pile with a groove;

[0019] Figure 4 Fig. 5 is a perspective view of a batter leg foundation;

[0020] Figure 5 Fig. 6 is a sectional view of a batter leg foundation;

[0021] Figure 6 Fig. 7 is a schematic view of a foundation pit excavation;

[0022] Reference signs:

[0023] 1 - retaining pile, 2 - crown beam, 3 - retaining wall, 4 - batter leg, 5 - batter leg foundation, 6 - longitudinal beam, 7 - transverse distribution beam, 8 - bridge deck slab;

[0024] 11 - groove, 51 - guide hole, 52 - second through hole, 53 - open slot. DETAILED DESCRIPTION

[0025] The embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0026] Please refer to Figures 1-2The utility model provides a diagonal leg rigid frame temporary bridge with foundation pit supporting function, is used for crossing foundation pit in one span, and it includes longitudinal beam 6 for laying bridge deck slab 8 and diagonal leg 4 for supporting longitudinal beam 6. The both ends of longitudinal beam 6 are fixedly connected with the top crown beam 2 of the two side support piles 1 of foundation pit respectively to obtain stable supporting force by means of crown beam 2 and the plurality of support piles 1 below it, that is, crown beam 2 is not only the bridge abutment body of temporary bridge but also the contact of support pile 1, and then bridge deck slab 8 can be laid between at least two adjacent longitudinal beams 6. Generally, transverse distribution beam 7 is also arranged between bridge deck slab 8 and longitudinal beam 6, which is small size I-beam and is arranged above longitudinal beam 6 at 2-3m interval, and bridge deck slab 8 is laid above transverse distribution beam 7. At least a pair of diagonal legs 4 is arranged below longitudinal beam 6, and the distal ends of the pair of diagonal legs 4 extend towards the two sides of foundation pit respectively, that is, the pair of diagonal legs 4 is arranged in an eight-shaped manner below longitudinal beam 6. In particular, the side of support pile 1 at the end of the extension path of diagonal leg 4 is also provided with diagonal leg foundation 5 to be fixedly connected with corresponding diagonal leg 4. The side, away from foundation pit, of crown beam 2 is provided with retaining wall 3, and the top end of retaining wall 3 is flush with the initial digging line of foundation pit. The end of longitudinal beam 6 is fixedly connected with corresponding crown beam 2 and retaining wall 3, that is, retaining wall 3 not only plays the role of retaining soil of foundation pit but also acts as the back wall of bridge abutment of temporary bridge. Since longitudinal beam 6 is connected with crown beam 2 and retaining wall 3, longitudinal beam 6, as the upper structure of steel temporary bridge, not only bears the load of bridge deck but also bears the lateral earth pressure of foundation pit, thereby playing the role of internal support of foundation pit. In one embodiment, when pouring crown beam 2, a pad plate is laid on the top surface of crown beam 2 in advance, and when constructing retaining wall 3, a connecting steel plate is preset on the surface of retaining wall 3 in advance, so as to be welded or screw-connected with the end of longitudinal beam 6 later.

[0027] As further improvement of the above scheme, the diagonal leg 4 comprises a plurality of type steel segments connected in sequence, so as to be prefabricated in advance and directly hoisted on site to be quickly assembled. The both ends of the type steel segment are respectively provided with a connecting plate, and the adjacent type steel segments are fastened and connected by high-strength bolts through the connecting plates, and the connecting plate can adopt a flange plate structure. The steel structure diagonal leg not only bears the load of the upper steel temporary bridge but also bears the lateral earth pressure of foundation pit. In one embodiment, the type steel segment adopts a box type steel structure, and there is one segment every 4-5m, and a connecting steel plate is welded at the end of the segment, and the segments are connected by high-strength bolts through the connecting steel plates; the diagonal leg 4 and the diagonal leg foundation 5 are connected by high-strength bolts through the connecting steel plates, and the transverse distance between the adjacent diagonal legs 4 is controlled according to the distance between foundation pit support and internal support.

[0028] Based on the diagonal leg rigid frame temporary bridge, the application further provides a construction procedure, which comprises the following steps:

[0029] S1: completing the construction of retaining wall (acting as bridge abutment back wall), support pile (acting as bridge abutment pile foundation), crown beam (acting as bridge abutment body); reserving connecting steel plate on the top surface of crown beam and the inner side of retaining wall; reserving diagonal leg foundation connecting steel bars in the reinforcement cage of support pile;

[0030] S2: Excavate the foundation pit to the inclined leg foundation elevation, and set up a pile-to-pile retaining plate. Excavation is performed along the path of the inclined leg (as shown in FIG. 2B). The partial protection layer of the retaining pile is chiseled out. The pre-embedded steel bars in the retaining pile are welded to the steel bars of the inclined leg foundation. The inclined leg foundation is poured with concrete. Meanwhile, a steel plate connected to the inclined leg is pre-embedded in the inclined leg foundation. Figure 6

[0031] S3: The steel segments are hoisted and connected in segments. During hoisting of the steel segments, the segments are placed on the top surface of the excavated soil, which serves as a temporary vertical support. The steel segments are connected by connecting plates to splice the complete inclined leg. The end of the inclined leg is connected to the inclined leg foundation by connecting steel plates.

[0032] S4: Hoist the steel cross brace (also serving as the bridge deck longitudinal beam). The steel cross brace is reliably connected to the steel inclined leg by connecting steel plates. The steel cross brace is welded or bolted to the top surface of the crown beam and the pre-embedded steel plate on the inner side of the retaining wall.

[0033] S6: Hoist the transverse distribution beam (steel structure) and weld it.

[0034] S7: Pave the temporary bridge deck and complete the steel temporary bridge.

[0035] As a further improvement of the above-mentioned scheme, the inclined leg rigid frame temporary bridge further comprises a traction anchor cable (not shown in the figure). One end of the traction anchor cable is anchored to one end of the inclined leg 4 facing the longitudinal beam 6. The other end of the traction anchor cable is embedded in the inclined leg foundation 5 after passing through the inclined leg 4. The purpose of setting the traction anchor cable is: on the one hand, the steel segments and the inclined leg foundation 5 are sequentially connected and longitudinally tensioned and anchored, so that the steel segments are connected as a whole and connected to the inclined leg foundation 5, improving stability and structural integrity. On the other hand, before the inclined leg 4 is fixed by screwing with the inclined leg foundation 5, the inclined leg 4 can be adjusted by pulling the traction anchor cable with a hoist to adjust the angle of the inclined leg 4, so that the top end of the inclined leg 4 accurately reaches the preset position, avoiding a large gap or interference between the longitudinal beam 6 and the inclined leg 4 after the longitudinal beam 6 is hoisted into place. The structure of the present application relies on the unexcavated soil in the foundation pit to realize temporary vertical support during hoisting of the steel segments. Due to the low accuracy of the excavated surface, misalignment occurs when connecting the steel segments, which increases the difficulty of installation. Moreover, when the soil is soft, the steel segments are prone to sink and deviate from the set position. Therefore, the traction anchor cable is designed to assist positioning. In particular, after the inclined leg 4 is adjusted to the appropriate position, the inclined leg 4 is connected to the inclined leg foundation 5 and the traction anchor cable is anchored.

[0036] As a further improvement of the above-mentioned scheme, the inclined leg foundation 5 can also be prefabricated. Please refer to FIG. 2A. Figures 3-4 ​, the retaining pile 1 at the end of the extension path of the inclined leg 4 is provided with a groove 11 on the side facing the foundation pit, and the inclined leg foundation 5 is embedded into the groove 11 on the side away from the foundation pit. Generally, the groove 11 is only provided on the retaining pile 1 where the inclined leg 4 is needed, and the remaining retaining piles 1 do not need to be grooved. The groove 11 is generally directly completed when the retaining pile 1 is cast in the field, and the main reinforcement in the pile cannot be damaged. The opposite two side walls of the groove 11 are each provided with a first through hole (not shown in the figure) penetrating the retaining pile 1, and the end of the inclined leg foundation 5 embedded into the groove 11 is provided with a second through hole 52 corresponding to the first through hole, so as to facilitate the locking of the inclined leg foundation 5 and the corresponding retaining pile 1 by the insertion rod. First, the inclined leg foundation 5 is supported by the bottom of the groove 11 or partially supported, and after the inclined leg foundation 5 is placed in place, the inclined leg foundation 5 can be anchored on the retaining pile 1 by the insertion rod. The groove 11 can be a hole groove or a long through groove in communication with the top surface of the retaining pile 1 as shown in Figure 3 .

[0037] As a further improvement of the above-mentioned scheme, the traction anchor cable embedded in the inclined leg foundation 5 can also be inserted with a rigging grommet or a carabiner. Please refer to Figure 5 , the inclined leg foundation 5 is provided with an open groove 53 on the side away from the inclined leg 4 for accommodating the rigging grommet or carabiner, and the second through hole 52 is in communication with the open groove 53. The inclined leg foundation 5 is provided with a guide hole 51 on the side facing the inclined leg 4 for threading the traction anchor cable, the guide hole 51 is in communication with the open groove 53, and the diameter of the guide hole 51 is smaller than the outer contour of the rigging grommet or carabiner, so that when the inclined leg foundation 5 is installed, the rigging grommet or carabiner can be tightly attached to the inner wall of the open groove 53 by externally pulling the traction anchor cable, and then the setting position and angle of the rigging grommet or carabiner are limited by the open groove 53, so that the insertion rod can pass through after the first through hole and the second through hole 52.

[0038] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and description of the present application.

Claims

1. A diagonal legged rigid frame temporary bridge having a function of supporting a foundation pit, characterized by comprising: It includes the longitudinal beam (6) for laying the bridge deck slab (8) and the inclined leg (4) for supporting the longitudinal beam (6); the longitudinal beam (6) is fixedly connected with the top corbel (2) of the foundation pit two-side enclosure pile (1) at both ends, and at least one pair of the inclined leg (4) is arranged below the longitudinal beam (6); one end of the pair of inclined legs (4) extends towards the two sides of the foundation pit respectively, and the inclined leg foundation (5) is arranged on the surface side of the enclosure pile (1) in the extension path of the inclined leg (4); the inclined leg foundation (5) is fixedly connected with the corresponding inclined leg (4); The corbel (2) is provided with a retaining wall (3) on the side away from the foundation pit, and the top end of the retaining wall (3) is flush with the initial excavation line of the foundation pit; the end of the longitudinal beam (6) is fixedly connected with the corresponding corbel (2) and retaining wall (3).

2. The inclined leg rigid frame temporary bridge with foundation pit support function according to claim 1, characterized in that, It also includes a traction anchor cable, one end of which is anchored towards the end of the inclined leg (4) away from the longitudinal beam (6), and the other end of which is embedded in the inclined leg foundation (5) after penetrating the inclined leg (4).

3. The inclined leg rigid frame temporary bridge with foundation pit support function according to claim 2, characterized in that, The enclosure pile (1) in the extension path of the inclined leg (4) is provided with a groove (11) on the side facing the foundation pit, and the end of the inclined leg foundation (5) away from the foundation pit is embedded in the groove (11).

4. The bridge according to claim 3, wherein The opposite two side walls of the groove (11) are each provided with a first through hole penetrating the enclosure pile (1), and the end of the inclined leg foundation (5) embedded in the groove (11) is provided with a second through hole (52) corresponding to the first through hole, so as to lock the inclined leg foundation (5) and the corresponding enclosure pile (1) by inserting a rod.

5. The bridge according to claim 4, wherein The traction anchor cable is inserted into the inclined leg foundation (5) and connected with the inserting rod through a rigging grommet or a carabiner.

6. The bridge according to claim 5, wherein The side of the inclined leg foundation (5) away from the inclined leg (4) is provided with an open slot (53) for accommodating the rigging grommet or carabiner, and the second through hole (52) is in communication with the open slot (53).

7. The bridge according to any one of claims 1 to 6, wherein the bridge is characterized by, The inclined leg (4) includes a plurality of type steel segments connected in sequence, and the two ends of the type steel segment are each provided with a connecting plate.

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