CN204343174U - A Construction Support for No. 0 Block of Prestressed Concrete Cantilevered Continuous Beam - Google Patents

Abstract

The utility model discloses a prestressed concrete hangs and waters continuous beam zero number piece construction support, this construction support is equipped with the preformed hole including fixing the three angle steel trusses in the pier stud both sides on the pier stud, wears to be equipped with the prestressing tendons in the preformed hole, and the three angle steel trusses pass through the prestressing tendons and install on the pier stud. The construction bracket of the utility model is directly built on the basis of the pier stud, and the raw materials are saved on the premise of ensuring the stability of the built foundation; the triangular steel truss is arranged on the pier stud through the prestressed tendons and the matched components, so that the final stress points of the construction support are concentrated on the stretched prestressed tendons and the support seat, and the structural stability of the construction support is guaranteed by utilizing the high bearing capacity of the prestressed tendons and the support seat; in addition, a supporting foundation does not need to be additionally erected in the construction process, field high-altitude welding and cutting operations are not needed, all materials can be directly disassembled and recycled after construction is finished, manpower and materials are saved, the construction period is effectively shortened, the influence on the construction environment is reduced, and the method is green and environment-friendly.

Description

A Construction Support for No. 0 Block of Prestressed Concrete Cantilevered Continuous Beam

technical field

The utility model belongs to the field of road and bridge building construction, in particular to a zero-block construction support for prestressed concrete cantilevered continuous girders.

Background technique

With the advancement of technology and the application of new materials, long-span reinforced concrete continuous beams are widely used in bridge projects spanning roads, railways, and rivers. During the construction process of continuous beam cantilever pouring, the zero block is used as the beam structure on the top of the pier, and is the working platform for the assembly of hanging baskets.

At present, the prestressed concrete zero-block pouring of deep water pier tops and super high land pier tops mostly adopts support construction. There are three commonly used construction supports and construction methods, including: ① directly erecting steel pipe supports from land, ② burying steel pipe piles in water to form Supporting system, ③ pre-embed steel bars or steel plates in the pier columns, and weld triangular steel trusses on the steel bars or steel plates after removing the formwork, and then set horizontal distribution beams + vertical slope adjustment steel frames on the triangular steel trusses. Among them, the third construction support is currently more ideal.

For example, the Chinese patent document with the announcement number CN 203977301 U discloses a kind of cantilever concrete zero block construction diagonal brace bracket for the bridge body. Set up columns, set up diagonal brace structures at both ends of the columns and longitudinal beams, the bottom of the diagonal brace structures is supported by caps, so that a triangular truss support is formed between the caps and the longitudinal beams, and the connection between the columns and the longitudinal beams is towards the middle of the diagonal brace structure. The fixed connection has a cable-stayed structure, and the shown diagonal-bracing structure adopts steel pipes, and the cable-stayed structure adopts I-beam.

For example, the Chinese patent document with the notification number CN 202347446 U discloses a construction support structure for the zero-block construction of reinforced concrete continuous beams. The support structure between the cap and the longitudinal beam is symmetrically distributed on both sides of the pier body, the support structure includes each upright column standing between the cap and the pier body, and the vertical column at the top that is inclined longitudinally to the outside of the pier body Diagonal braces form a triangular truss support between the cap and the longitudinal beams; the upright columns and diagonal braces are made of steel pipe columns.

The disadvantages of these three construction supports and construction methods are: ① It is the easiest to build supports directly from the ground for super-high piers on land, but the safety is poor, it takes a long time to build and disassemble, and the amount of materials is large; Complex, difficult to cut in water, high cost, and long construction period; ③The method of pre-embedding steel bars or steel plates and then welding triangular steel trusses is relatively cumbersome, and the installation of high-altitude vertical welding on site is difficult, the quality is not easy to guarantee, and the safety hazard is relatively large; and The loading and unloading process is also time-consuming and labor-intensive (a large amount of welding is required for installation, and high-altitude cutting is required for disassembly), and the welding of the shaped steel frame at the bottom of the beam is complicated, and it cannot adapt well to changes in the slope of different beam bottoms (in many cases, it can only be used once) , poor versatility; embedded parts cannot be reused, and are consumed at one time (such as steel bars, steel plates, etc.).

Utility model content

The utility model provides a prestressed concrete cantilever cast continuous beam zero-block construction support, which has a high reutilization rate, reduces construction cost, is simple and easy to operate in the assembly process, and shortens the construction period.

A prestressed concrete cantilevered continuous beam zero-block construction support, including triangular steel trusses fixed on both sides of the pier column, the pier column is provided with a reserved hole, and prestressed tendons are pierced in the reserved hole. The triangular steel trusses are installed on the pier columns through prestressed tendons.

The construction support of the utility model does not need to build additional support foundations, and is directly built on the pier column, which saves raw materials on the premise of ensuring the stability of the foundation; the triangular steel truss is installed on the pier column through prestressed tendons. On the one hand, the construction The final force of the bracket is borne by the stretched prestressed tendons. The prestressed tendons have a relatively ideal bearing capacity, which ensures the structural stability of the construction bracket; All can be directly disassembled and reused, which reduces the construction cost.

In the utility model, the installation method of the triangular steel truss is:

The side wall of the pier column is fixed with a support base through the first prestressed tendon, and a connecting piece is fixed through the second prestressed tendon; the bottom of the triangular steel truss is against the support base, and the top of the triangular steel truss is connected by The restraint of the piece rests against the side wall of the pier.

Fix the supporting seat by stretching and anchoring the first prestressed tendon, and the supporting seat acts as the fulcrum of the triangular steel truss, transferring the force of the triangular steel truss to the first prestressed tendon and the supporting seat; fix by stretching and anchoring the second prestressed tendon A connecting piece, the connecting piece binds the triangular steel truss to the side wall of the pier column by using the tensile anchoring force of the second prestressed tendon.

Preferably, a reserved groove for installing a support base is provided at the opening of the reserved hole on the column surface on the pier column, and the support base is provided with a first through hole through which the first prestressing tendons pass. The reserved groove provides a fulcrum for the support seat, so that the support seat can withstand more pressure from the triangular steel truss, so that the triangular steel truss is always fixed at the predetermined position, ensuring the structural stability of the construction support.

The connecting piece is also provided with a second through hole through which the prestressing tendons pass.

Preferably, the triangular steel trusses are arranged in pairs on both sides of the piers, and the triangular steel trusses belonging to the same pair share the first prestressing tendons and the second prestressing tendons.

As a further preference, there are at least two triangular steel trusses on the same side of the pier column. In this way, the upper pouring mold can be erected on at least two triangular steel trusses, and the load of the construction support is shared by multiple prestressed tendons, which reduces the load bearing of each prestressed tendon, which not only improves the structural stability and safety of the construction support, but also Improve the service life of prestressed tendons.

Preferably, the triangular steel trusses are staggered on adjacent side surfaces of the piers.

Preferably, a reinforcing plate is provided at the corner of the triangular steel truss. Stiffeners are used to increase the load-bearing capacity of triangular steel trusses.

As a further preference, the triangular steel truss is welded by double I-beams.

The construction method of the zero-block construction support of the prestressed concrete cantilevered continuous beam includes:

(1) When pouring pier columns, pre-embed PVC pipes and wooden boxes at the required positions to form reserved holes and reserved grooves;

(2) After the concrete of the pier column reaches the required strength, penetrate the first prestressed tendons and the second prestressed tendons in the corresponding reserved holes;

(3) Install the support seat in the reserved groove, and the two ends of the first prestressed tendon protrude from the first through hole of the support seat and fix the anchor;

(4) Put the bottom of the triangular steel truss against the support seat, place the top of the triangular steel truss between the pier column and the connecting piece, the end of the second prestressed tendon extends out of the second through hole of the connecting piece and Fix the anchor, lock the triangular steel truss and make it lean against the side wall of the pier column;

(5) On the top surface of the triangular steel truss, erect the H-shaped steel longitudinal beam according to the conventional procedure, set up the heavy-duty portal-type steel pipe support above the H-shaped steel longitudinal beam, install wooden shelves on the top support of the portal-type steel pipe support, and lay bamboo plywood, The bamboo plywood is the pouring mold, and the construction of the construction support is completed so far.

After the construction support is completed, the steel bars can be welded and bound, and the concrete is poured horizontally and vertically symmetrically. After the concrete reaches the design strength, the construction support is removed in turn, and the reserved holes and grooves are grouted, and then enter the next round of construction.

It should be noted that the corresponding prestress should be applied before the installation of the triangular steel truss to offset the elongation of the prestressed tendons to ensure the safety of the construction support.

Compared with the prior art, the beneficial effects of the utility model are:

The construction support of the utility model is directly built on the basis of pier columns, which saves raw materials under the premise of ensuring that the foundation is stable; the triangular steel truss is installed on the pier columns through prestressed tendons. On the one hand, the final force of the construction support is determined by The stretched prestressed tendons and the supporting seat are shared, and both the prestressed tendons and the supporting seat have a relatively ideal bearing capacity, which ensures the structural stability of the construction support; on the other hand, there is no need to build additional supporting foundations during the construction process, and no need On-site high-altitude welding and cutting operations are carried out. After the construction is completed, all materials can be directly disassembled and reused, which saves labor and materials to a large extent, effectively shortens the construction period, reduces the impact on the construction environment, and is green and environmentally friendly.

Description of drawings

Fig. 1 is the structural representation of a kind of prestressed concrete cantilevered continuous girder zero block construction support of the utility model;

Fig. 2 is a structural schematic view of the zero block construction support of a prestressed concrete cantilevered continuous beam of the utility model under another viewing angle;

Among them, 1: pier column, 11: reserved hole, 12: reserved groove; 21: first prestressed tendon, 22: second prestressed tendon; 31: support seat, 32: connector; 4: anchorage; 5: Triangular steel truss, 51: Strengthening plate, 52: Horizontal section, 53: Vertical section, 54: Diagonal bracing section; 6: H-shaped steel longitudinal beam; 7: Heavy-duty portal steel pipe support; 8: Wooden rail; 9: Bamboo plywood; 10: box girder.

Detailed ways

As shown in Fig. 1 and Fig. 2, this embodiment is a prestressed concrete cantilevered continuous beam zero block construction support, the construction support includes a reserved hole 11 arranged on the pier column 1, and the reserved hole 11 runs through the pier column 1. Openings at both ends of the same reserved hole 11 are respectively located on two opposite sides of the pier column 1 . In this embodiment, on the two opposite sides of the pier column 1, the reserved holes 11 are divided into upper and lower rows arranged in parallel, and each row of reserved holes 11 is divided into two pairs of left and right. The upper and lower pairs of reserved holes 11 on the left side are jointly used for installing a triangular steel truss 5 , and the upper and lower pairs of reserved holes 11 on the right side are jointly used for installing a triangular steel truss 5 . On the adjacent side of the pier column 1, the reserved holes 11 are misplaced (two rows up and down, four pairs in each row).

It can be seen from FIG. 1 that the first prestressed tendons 21 are pierced in the reserved holes 11 in the lower row, and the second prestressed tendons 22 are pierced in the reserved holes 11 in the upper row. Wherein, there is also a reserved groove 12 at the opening of the cylinder of the reserved hole 11 that is pierced with the first prestressed tendon 21, and a support seat 31 is installed in the reserved groove 12, and a support seat 31 is provided in the support seat 31 for the first prestressed rib. The first through hole through which the stress tendon 21 passes, and the two ends of the first prestress tendon 21 protrude from the first through hole of the support base 31 and fix the anchor 4 .

The two ends of the second prestressed tendons 22 are respectively equipped with connectors 32, and the second through holes for the second prestressed tendons 22 to pass are provided in the connectors 32, and the two ends of the second prestressed tendons 22 stretch out the second Through the hole and fix the anchor 4.

In this embodiment, the support seat 31 is inverted L-shaped, and a part of the inverted L-shaped support seat 31 is embedded in the reserved groove 12, and a part is attached to the side wall of the pier column 1; the connecting piece 32 is a double-piece I-beam . Moreover, two first prestressed tendons 21 are pierced on the same support base 31 , and two second prestressed tendons 22 are pierced on the same connecting piece 32 .

It can be seen from Fig. 1 that triangular steel trusses 5 are fixed on the opposite sides of the pier column 1, and the triangular steel trusses 5 are arranged in pairs on both sides of the pier column 1, and the triangular steel trusses 5 belonging to the same pair share the first prestress Rib 21 and the second prestressed tendon 22.

In this embodiment, the triangular steel truss 5 includes a horizontal section 52, a vertical section 53 and a brace section 54 which are welded end to end in sequence. Three corners of the steel truss 5 are provided with reinforcing plates 51 .

It can be seen from Fig. 1 and Fig. 2 that the lower end of the vertical section 53 of the triangular steel truss 5 leans against the support base 31, and the upper end of the vertical section 53 of the triangular steel truss 5 is locked by the connecting piece 32 and abuts against the bottom of the pier 1. on the side wall.

A row of H-shaped steel longitudinal beams 6 are erected on the horizontal section 52 of the triangular steel truss 5 according to the designed spacing, and a heavy-duty portal-type steel pipe support 7 is erected above the H-shaped steel longitudinal beams 6, and wooden shelves 8 are installed on the top support of the portal-type steel pipe support 7 And lay bamboo plywood 9.

In the present embodiment, the building method of this construction support is:

(1) When pouring the pier column 1, pre-embed the PVC pipe at the required position to form a reserved hole 11, and pre-embed wooden boxes at both ends of the PVC pipe to form a reserved groove 12;

(2) After the concrete of the pier column 1 reaches the required strength, penetrate the first prestressed tendons 21 and the second prestressed tendons 22 in the corresponding reserved holes 11;

(3) Install the support seat 31 in the reserved groove 12, and the two ends of the first prestressed rib 21 stretch out the first through hole of the support seat 31 and fix the anchor 4;

(4) The bottom of the triangular steel truss 5 is leaned against the supporting seat 31, the top of the triangular steel truss 5 is placed between the pier column 1 and the connector 32, and the end of the second prestressed tendon 22 stretches out to connect The second through hole of the member 32 and fix the anchor 4, lock the triangular steel truss 5 and make it lean against the side wall of the pier 1;

(5) On the top surface of the triangular steel truss 5, the H-shaped steel longitudinal beam 6 is erected according to the conventional procedure, and the portal-type steel pipe support 7 is set up above the H-shaped steel longitudinal beam 6, and the wooden frame 8 is installed on the jacking of the portal-type steel pipe support 7 , the bamboo plywood 9 is laid, and the bamboo plywood 9 is used as a pouring mold, so far the construction of the construction support is completed.

After the construction support is built, the steel bars can be welded and bound, and the concrete is poured horizontally and vertically symmetrically. After the concrete reaches the predetermined strength, the construction support is removed in turn, and grouting is performed in the reserved hole 11 and the reserved groove 12, and then enters the next round of construction. construction.

It should be noted that the corresponding prestress should be applied before the installation of the triangular steel truss 5 to offset the elongation of the prestressed tendons to ensure the safety of the construction support.

Claims (8)

1. A prestressed concrete cantilevered continuous beam zero-block construction support, including triangular steel trusses fixed on both sides of the pier column, is characterized in that the pier column is provided with a reserved hole, and the reserved hole is pierced There are prestressed tendons, and the triangular steel truss is installed on the pier column through the prestressed tendons. 2. The prestressed concrete cantilevered continuous beam zero block construction support as claimed in claim 1, wherein the installation method of the triangular steel truss is: The side wall of the pier column is fixed with a support base through the first prestressed tendon, and a connecting piece is fixed through the second prestressed tendon; the bottom of the triangular steel truss is against the support base, and the top of the triangular steel truss is connected by The restraint of the piece rests against the side wall of the pier. 3. The prestressed concrete cantilevered continuous beam zero block construction support as claimed in claim 2, characterized in that, the opening of the reserved hole on the column surface on the pier column is provided with a reserved groove for installing the support seat , the support seat is provided with a first through hole through which the first prestressing tendon passes. 4. The zero-block construction support for prestressed concrete cantilevered continuous beams as claimed in claim 2, wherein the triangular steel trusses are arranged in pairs on both sides of the pier columns, and the triangular steel trusses belonging to the same pair share the first A prestressing tendon and a second prestressing tendon. 5. The prestressed concrete cantilevered continuous beam zero block construction support according to claim 4, characterized in that there are at least two triangular steel trusses on the same side of the pier column. 6. The zero-block construction support for prestressed concrete cantilevered continuous beams according to claim 4, characterized in that, on the adjacent side surfaces of the pier columns, the triangular steel trusses are arranged in dislocations. 7. The prestressed concrete cantilevered continuous girder zero block construction support according to any one of claims 1 to 6, characterized in that a reinforcing plate is provided at the corner of the triangular steel truss. 8. The prestressed concrete cantilevered continuous girder zero block construction support according to claim 7, characterized in that the triangular steel truss is welded by double I-beams.