Support system for cast-in-place bridge construction period at steep cliff

Abstract

The utility model discloses a support system for the construction period of a cast-in-place bridge at a steep cliff, relates to the technical field of bridge construction, and aims to ensure the stability and safety of a truss which is relatively independent from a pier stud in the support system. Comprising a first pile foundation located on one side of a hillside and a second pile foundation located on one side of a furrow, a pier column is arranged on a pile head of the second pile foundation, a second truss is erected on the side, close to the hillside, of the pier column, the second truss abuts against the pier column and is connected with the pier column through a holding mechanism, and a first truss is erected on a slope body between the first pile foundation and the second pile foundation; a stabilizing pier is erected on at least one side of the two sides of the first truss, the stabilizing pier is a truss and is fixedly connected with the first truss into a whole, and the second truss is connected with the adjacent first truss or stabilizing pier through a tying piece; bailey beams and full framing are arranged on the upper portions of the first pile foundations, the first trusses and the second trusses from bottom to top. The device is used for construction of the cast-in-place bridge at the steep cliff.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a support system for cast-in-place bridge construction under the condition of large height difference of pile foundations of left and right bridge piers at steep cliffs in mountain valleys. Background Art

[0002] Mountain highways are arranged along mountains and rivers, and bridges are constructed on steep cliffs. There are large spans, large cross slopes, and large height differences between the left and right bridge piers, so the construction safety risks are relatively high. If the structural form and layout of the support system for the construction of such bridges are not properly set, it will bring many problems to the subsequent construction, affecting both the progress and the appearance quality, and there are also great safety risks.

[0003] The patent with the authorization announcement number CN 217149897 U (application number 202220359410.5) discloses a cast-in-place bracket for a steel tube Bailey beam bridge. The bracket is provided with embedded parts, bracket columns, distribution beams and Bailey beams from bottom to top. The embedded parts are installed on the pedestal, the bridge deck is installed above the Bailey beam, the scaffolding is installed above the bridge deck, and the formwork is installed above the scaffolding. The patent adopts a system of few brackets consisting of steel tube columns and Bailey beams. The stability of steel tube columns is poor when the support height is large. When constructing bridges on steep cliffs, the support height of the required bracket system is often large. Therefore, the system of few brackets including steel tube columns is not applicable.

[0004] The patent with the authorization announcement number CN 217651623 U discloses a combined support system, including an SPS truss, a Bailey beam and a full-frame installed in sequence from bottom to top. The connection between the SPS truss and the Bailey beam is installed with an I-beam as a supporting main beam and a distribution beam for load transfer, and the connection between the Bailey beam and the full-frame is installed with a U-shaped steel as a load-bearing beam of the full-frame. The SPS truss is arranged on the inner side of the end pier of the bridge box girder and on the inner and outer sides of the non-end pier of the bridge box girder. The SPS truss is arranged close to the pier of the bridge box girder. In order to ensure the stability of the SPS truss, the SPS truss is connected to the corresponding pier through a clamping mechanism, which is a clamping column surrounded by the outside of the bridge box girder pier. When constructing a bridge at a steep cliff, due to the large span, it is often necessary to set a truss separately at a position where the bridge box girder pier is not set. The truss at this position cannot be connected to the pier through a clamping mechanism, and there is a problem of insufficient stability. Utility Model Content

[0005] The utility model provides a support system for a cast-in-place bridge at a steep cliff during construction, aiming to ensure the stability and safety of a truss relatively independent of a pier column in the support system.

[0006] The technical scheme adopted by the utility model is: a support system for a cast-in-place bridge at a steep cliff during construction, comprising a first pile foundation located at one side of a hillside and a second pile foundation located at one side of a ravine, a pier column being provided on the pile head of the second pile foundation, a second truss being set up on the side of the pier column close to the hillside, the second truss being close to the pier column and the second truss being connected to the pier column through a clamping mechanism, a first truss being set up on the slope between the first pile foundation and the second pile foundation, two sides of the first truss being respectively a side close to the hillside and a side close to the ravine, a stabilizing pier being set up on at least one side of the two sides of the first truss, the stabilizing pier being a truss and being fixedly connected to the first truss as a whole, and the second truss being connected to the adjacent first truss or the stabilizing pier through a tie piece; the upper parts of the first pile foundation, the first truss and the second truss are Bailey beams and full-bridge supports from bottom to top.

[0007] In order to improve the integrity between the first truss and the second truss, further: there are multiple anchors, one end of some anchors pointing to the ravine is connected to the second truss, and one end of some anchors pointing to the ravine is connected to the clamping mechanism.

[0008] Specifically: the first truss, the second truss and the stabilizing pier are all SPS trusses, the anchors are steel pipes and steel pipe fasteners, and the clamping mechanism is a clamping column arranged outside the pier column.

[0009] In order to effectively connect the first truss, the second truss and the Bailey beam and transfer the load, further: a truss distribution crossbeam is respectively arranged on the top of the first truss and the second truss, a truss distribution longitudinal beam is arranged on the upper part of the truss distribution crossbeam, and the Bailey beam is erected on the truss distribution longitudinal beam. Specifically: the truss distribution crossbeam and the truss distribution longitudinal beam are both I-beams.

[0010] In order to ensure that the Bailey beam meets the force requirements and is easy to construct, further steps are taken: double three-row single-layer ordinary Bailey beams are used in the middle between the first pile foundation and the first truss, and double rows of single-layer ordinary Bailey beams are used on both sides; two three-row single-layer ordinary Bailey beams are used from the first truss to the cantilever end close to the second truss, which are located on both sides of the pier and close to the pier.

[0011] In order to effectively connect the Bailey beam and the full-bridge support and transfer the load, further: the upper part of the Bailey beam is provided with distribution ribs at intervals along the longitudinal direction, and the full-bridge support is directly erected on the distribution ribs. Specifically: the distribution ribs are U-shaped steel or I-shaped steel.

[0012] In order to increase the convenience of demoulding and reduce the overall weight, the top of the full-floor support is further arranged with distribution beams at intervals along the longitudinal direction, square timber is set on the upper part of the distribution beam, and the cast-in-place formwork is set on the square timber. Specifically: the distribution beam is U-shaped steel.

[0013] The beneficial effects of the utility model are as follows: a first truss is set up on the slope between the first pile foundation and the second pile foundation, and the stabilizing pier has a stabilizing effect on the first truss. In addition, the second truss is connected to the pier column, and the second truss, the first truss and the stabilizing pier form an integral structure, which improves the overall stability and anti-overturning ability. The first truss has a supporting effect on the Bailey beam and its superstructure, and the span of the Bailey beam can be larger. During the construction period of the cast-in-place bridge on the steep cliff, the support system has a simple structure, strong load-bearing capacity, and guaranteed stability. It can effectively solve the problem of difficulty in building a construction platform on the steep cliff, save materials, and ensure the safety of bridge construction on steep cliff terrain. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of an embodiment of the utility model.

[0015] Figure 2 yes Figure 1 A schematic elevation view of the first truss in the illustrated embodiment.

[0016] Figure 3 yes Figure 1 A schematic elevation view of the second truss in the illustrated embodiment.

[0017] Figure 4 yes Figure 1 Schematic diagram of the planar layout of the first pile foundation, the pier, the first truss and the second truss in the illustrated embodiment.

[0018] Figure 5 yes Figure 1 Schematic diagram of the planar arrangement of Bailey beams and distribution ribs in the illustrated embodiment.

[0019] Figure 6 yes Figure 1 Schematic diagram of the planar layout of the distribution beams at the top of the full-chamber support in the illustrated embodiment.

[0020] Figure numerals: first pile foundation 1, second pile foundation 2, pier 3, second truss 4, clamping mechanism 5, first truss 6, stabilizing pier 7, anchor 8, Bailey beam 9, full-bridge support 10, truss distribution crossbeam 11, truss distribution longitudinal beam 12, distribution rib 13, distribution beam 14. DETAILED DESCRIPTION

[0021] The utility model will be further described below in conjunction with the accompanying drawings.

[0022] like Figures 1 to 6As shown, the support system for the cast-in-place bridge construction period at the steep cliff of the utility model includes a first pile foundation 1 located on one side of the hillside and a second pile foundation 2 located on one side of the ravine. The first pile foundation 1 and the second pile foundation 2 are both arranged vertically. The tops of the first pile foundation 1 and the second pile foundation 2 are both located close to the slope surface. The elevation of the top of the first pile foundation 1 is greater than the elevation of the top of the second pile foundation 2. The pile head of the second pile foundation 2 is a pier 3, which is a reinforced concrete structure used to support the bridge. A second truss 4 is set up on the side of the pier 3 close to the hillside. The second truss 4 is the main pier at the end of the span. The second truss 4 is arranged close to the pier 3 so that the bottom of the second truss 4 is firmly supported. The second truss 4 is connected to the pier 3 through a clamping mechanism 5, that is, the second truss 4 is attached and fixed to the pier 3 through the clamping mechanism 5 to improve the integrity of the second truss 4 and the pier 3 and improve the stability of the second truss 4. The clamping mechanism 5 is generally a holding column arranged outside the pier 3, and the holding column includes a longitudinal rod support and a transverse rod support. The longitudinal rod support and the transverse rod support have the same structure, and are both steel pipes. The steel pipes are connected by steel pipe fasteners. A first truss 6 is erected on the slope between the first pile foundation 1 and the second pile foundation 2, and the first truss 6 is independently supported at the mid-span. The two sides of the first truss 6 are respectively the side close to the hillside and the side close to the ravine. A stabilizing pier 7 is erected on at least one of the two sides of the first truss 6. The stabilizing pier 7 is used to improve the stability of the first truss 6. The stabilizing pier 7 is also a truss and is fixedly connected to the first truss 6 as a whole. The first truss 6, the second truss 4 and the stabilizing pier 7 are generally SPS trusses. The bottom of the SPS truss adopts an adjustable top support, which can be adjusted in height according to needs. In order to improve the integrity of the first truss 6, the second truss 4 and the stabilizing pier 7, the second truss 4 is connected to the adjacent first truss 6 or stabilizing pier 7 by a tie member 8. For example, see Figure 1 and Figure 4 , the first truss 6 is provided with a stabilizing pier 7 only on one side close to the second truss 4, and the stabilizing pier 7 is connected to the second truss 4 through a steel pipe and a steel pipe fastener. The anchors 8 are divided into multiple layers, and the number of layers is determined according to the arrangement height of the stabilizing pier 7. The number of anchors 8 in each layer is multiple, that is, there are at least two layers of anchors 8, and each layer has at least two. In order to improve the integrity between the first truss 6 and the second truss 4, one end of a part of the anchors 8 pointing to the ravine is connected to the second truss 4, and one end of a part of the anchors 8 pointing to the ravine is connected to the clamping mechanism 5. For example, there are four anchors 8 in each layer, two of which are connected to the second truss 4 at one end pointing to the ravine, and the other two anchors 8 are connected to the clamping mechanism 5 at one end pointing to the ravine, forming a double stable structure, so that the entire support system forms an integral structure, and the anti-overturning ability of the support system is increased. For another example, each layer of anchors 8 includes two outer fasteners and two inner fasteners. The two outer fasteners are fastened to the second truss 4 and locked, and the two inner fasteners are fastened to the clamping mechanism 5 to achieve connection with the pier 3 .

[0023] The tops of the first pile foundation 1, the first truss 6, and the second truss 4 are Bailey beams 9 and full-frame brackets 10 from bottom to top, and the full-frame brackets 10 are used to support the cast-in-place formwork. In order to effectively connect the first truss 6, the second truss 4 and the Bailey beam 9 and transfer the load, a truss distribution crossbeam 11 is respectively arranged on the top of the first truss 6 and the second truss 4, and a truss distribution longitudinal beam 12 is arranged on the upper part of the truss distribution crossbeam 11, and the Bailey beam 9 is erected on the truss distribution longitudinal beam 12. The truss distribution crossbeam 11 and the truss distribution longitudinal beam 12 are both I-beams, for example, both are double 45a I-beams.

[0024] Bailey beam 9 is the main load-bearing component that bears the upper load and crosses the steep cliff. According to the relative positions and spans of the first pile foundation 1, the first truss 6, and the second truss 4, and under the specific condition that there are two first pile foundations 1, in order to ensure that the Bailey beam 9 meets the force requirements and is easy to construct, the Bailey beam 9 is arranged in two ways. A double three-row single-layer ordinary Bailey beam is used in the middle between the first pile foundation 1 and the first truss 6, and a double row of single-layer ordinary Bailey beams are used on both sides; two three-row single-layer ordinary Bailey beams are used from the first truss 6 to the cantilevered end close to the second truss 4, which are located on both sides of the pier 3 and close to the pier 3. The Bailey beam 9 can easily cross the steep cliff and has a strong bearing capacity. At the same time, double-row, triple-row, and double-three-row combinations are used to meet the force requirements while saving material usage. Figure 5 As shown. In order to effectively connect the Bailey beam 9 and the full-frame bracket 10 and transfer the load, the upper part of the Bailey beam 9 is provided with distribution ribs 13 along the longitudinal interval, and the full-frame bracket 10 is directly erected on the distribution ribs 13. The distribution ribs 13 are actually a kind of distribution beam, and the distribution ribs 13 are generally U-shaped steel or I-shaped steel. For example, the top of the Bailey beam 9 is provided with double U-shaped steel or 25a I-shaped steel as the distribution ribs 13.

[0025] The full-chamber support 10 is the direct carrier of the cast-in-place formwork. In order to increase the convenience of demoulding and reduce the overall weight, the top of the full-chamber support 10 is arranged with distribution beams 14 at intervals along the longitudinal direction. The upper part of the distribution beams 14 is provided with square timbers, and the cast-in-place formwork is erected on the square timbers. The distribution beams 14 are U-shaped steel. The cast-in-place formwork can be plywood, and square timbers are used under the plywood. Double U-shaped steels are used under the square timbers as distribution beams 14. The distribution beams 14 are connected to the full-chamber support 10, such as Figure 6 As shown. By combining steel and wood, the demoulding convenience is increased, the overall weight is reduced, and the structure is simple and the force is stable.

[0026] The following is an explanation of the construction of the support system during the construction period of the cast-in-place bridge at the steep cliff. After the construction of the first pile foundation 1 and the second pile foundation 2 is completed and the strength meets the requirements, the bottom layer of the truss is assembled. After the second layer is erected on the ground, the whole is hoisted and installed, and it is installed layer by layer, and steel pipe fasteners are used for locking connection. The second truss 4 close to the pier 3 is installed first and attached to the pier 3 through the clamping mechanism 5. The first truss 6 is constructed later. When the first truss 6 is installed, the stabilizing pier 7 is constructed simultaneously. The first truss 6 and the stabilizing pier 7 are connected as a whole and connected to the second truss 4 and the clamping mechanism 5 through the tie piece 8. After installation to the design elevation, check whether each connection is locked one by one, and adjust the height according to needs.

Claims

1. A support system for a cast-in-place bridge at a steep cliff during construction, comprising a first pile foundation (1) located on one side of a hillside and a second pile foundation (2) located on one side of a ravine, a pier (3) being provided on the pile head of the second pile foundation (2), a second truss (4) being provided on the side of the pier (3) close to the hillside, the second truss (4) being close to the pier (3) and connected to the pier (3) via a clamping mechanism (5), wherein: A first truss (6) is erected on the slope between the first pile foundation (1) and the second pile foundation (2), the two sides of the first truss (6) are respectively a side close to the hillside and a side close to the ravine, a stabilizing pier (7) is erected on at least one of the two sides of the first truss (6), the stabilizing pier (7) is a truss and is fixedly connected to the first truss (6) as a whole, and the second truss (4) is connected to the adjacent first truss (6) or the stabilizing pier (7) through a tie member (8); the upper parts of the first pile foundation (1), the first truss (6) and the second truss (4) are Bailey beams (9) and full-height brackets (10) from bottom to top.

2. The support system for the cast-in-place bridge construction at a steep cliff as claimed in claim 1 is characterized by: There are a plurality of anchors (8), one end of a portion of the anchors (8) pointing toward the ravine is connected to the second truss (4), and one end of a portion of the anchors (8) pointing toward the ravine is connected to the clamping mechanism (5).

3. The support system for the cast-in-place bridge construction at a steep cliff as claimed in claim 1 is characterized by: The first truss (6), the second truss (4) and the stabilizing pier (7) are all SPS trusses, the anchor (8) is a steel pipe and a steel pipe fastener, and the clamping mechanism (5) is a clamping column arranged outside the pier column (3).

4. The support system for the cast-in-place bridge construction at a steep cliff as claimed in claim 1 is characterized by: A truss distribution crossbeam (11) is respectively arranged on the top of the first truss (6) and the second truss (4), a truss distribution longitudinal beam (12) is arranged on the upper part of the truss distribution crossbeam (11), and the Bailey beam (9) is erected on the truss distribution longitudinal beam (12).

5. The support system for the cast-in-place bridge construction at a steep cliff as claimed in claim 4 is characterized by: The truss distribution cross beam (11) and the truss distribution longitudinal beam (12) are both I-beams.

6. The support system for the cast-in-place bridge construction at a steep cliff as claimed in claim 1 is characterized by: A double three-row single-layer ordinary Bailey beam is used in the middle between the first pile foundation (1) and the first truss (6), and a double row of single-layer ordinary Bailey beams are used on both sides; two three-row single-layer ordinary Bailey beams are used from the first truss (6) to the cantilevered end close to the second truss (4), which are respectively located on both sides of the pier (3) and close to the pier.

7. The support system for the cast-in-situ bridge construction at a steep cliff as claimed in any one of claims 1 to 6, characterized in that: The upper part of the Bailey beam (9) is provided with distribution ribs (13) at intervals along the longitudinal direction, and the full-chamber bracket (10) is directly erected on the distribution ribs (13).

8. The support system for the cast-in-situ bridge construction at a steep cliff as claimed in claim 7 is characterized by: The distribution rib (13) is a U-shaped steel or an I-shaped steel.

9. The support system for the cast-in-situ bridge construction at a steep cliff as claimed in any one of claims 1 to 6, characterized in that: Distribution beams (14) are arranged at intervals along the longitudinal direction on the top of the full-floor support (10), square timbers (15) are arranged on the upper part of the distribution beams (14), and the cast-in-place formwork is erected on the square timbers (15).

10. The support system for the cast-in-situ bridge construction at a steep cliff as claimed in claim 9, characterized in that: The distribution beam (14) is a U-shaped steel.

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