Bridge cast stone balustrade connected through grouting of stand columns and construction method of bridge cast stone balustrade

Abstract

The invention discloses a bridge cast stone balustrade connected through grouting of stand columns and a construction method of the bridge cast stone balustrade, belongs to the field of bridge balustrades and solves the problems that a traditional stone balustrade is too large in dead weight, a base is heavy and installation is not firm. The device comprises a stand column and a breast board, the stand column is installed on a base, an installation notch is formed in the top of the base, a cavity is formed in the stand column, the bottom of the cavity is of an open structure, concrete is integrally poured into the cavity and the installation notch, and the concrete in the cavity is not poured to the top of the stand column. The construction method comprises the following steps: constructing the mounting notches and forming shear keys; stand column embedded steel bars are arranged at the positions of the mounting notches; the stand columns are arranged at the positions of the mounting notches; concrete is poured into the cavity and the mounting notch through the pouring opening; and the pouring opening is blocked. The self weight of the stone balustrade is effectively reduced, the load of a bridge body is reduced, the balustrade stand columns and the base are poured into a whole in a stand column top pouring connection mode, the stability of the balustrade is enhanced, and the structural size of the base is reduced.

Description

Technical Field

[0001] The invention belongs to the field of bridge railings, and in particular relates to a bridge cast stone railing connected by column grouting and a construction method thereof. Background Art

[0002] Bridge railings are common bridge auxiliary structures. For conventional bridges, good railing shapes can play a role in identifying bridge structures and beautifying the surrounding environment, and are important landscape components. Stone railings have a long history, are durable, beautiful, and can be coordinated with the surrounding environment. They are widely used on bridges and often play a finishing touch. However, based on the characteristics of natural stone (heavy weight, high brittleness, and poor bending resistance), stone railings also have some defects. After investigating the stone railings of highways and municipal bridges, it was found that they are mainly manifested in the following aspects.

[0003] 1) Traditional stone railings are bulky and heavy. According to the "Urban Bridge Design Code" (CJJ 11-2011), "the vertical load acting on the sidewalk railing handrail should be 1.2kN / m; the horizontal outward load should be 2.5kN / m". The structural calculation of the stone railing shows that the column section is not less than 25×25cm, the handrail section is not less than 15×15cm, the column spacing is not more than 2.0m, and the stone strength grade is not less than MU120, in order to meet the standard design requirements. At this time, the deadweight of the railing has reached 4.5~5.5kN / m, which is much greater than carbon steel, stainless steel, concrete and other materials, increasing the load on the bridge body and having a certain impact on the bridge structure.

[0004] 2) The size of the railing foundation is large, and the column installation is not secure. Stone railings and bridges are mostly connected by tenon joints, that is, a concrete base is set on the bridge deck as the railing foundation, and grooves are opened at intervals of about 1.5 to 2.0m to bury the railing columns. The gaps between the columns and the grooves are filled and fixed with epoxy mortar. In order to meet the requirements of tenon installation and the minimum protective layer thickness of the base steel bars, the foundation size is usually much larger than the column size. For example, for a 25×25cm rectangular section column, the foundation thickness must be 45cm to meet the requirements. The foundation size is too large, which not only affects the appearance, but also increases the load on the bridge body. The columns and foundation are filled and fixed with epoxy mortar. If the vibration is not dense, the connection may become loose or fall off.

[0005] 3) The stone strength requirement is high, and the railing is expensive. From 1), we can see that the strength grade of the bridge stone railing is not less than MU120. Usually only granite with complete structure and uniform texture can meet the requirements, resulting in the price of the railing being much higher than that of concrete and steel railings.

[0006] In summary, natural stone railings for bridges have obvious advantages in terms of safety, durability, and aesthetics, but they also have disadvantages such as heavy weight, large foundation requirements, and relatively high prices. Therefore, designing a stone railing with a new material and new connection method that can solve the above problems has a very broad application prospect. Summary of the invention

[0007] The invention aims to provide a bridge cast stone railing connected by column grouting to solve the problems of excessive deadweight, heavy base and unstable installation of traditional stone railings.

[0008] Another object of the present invention is to provide a construction method for bridge cast stone railings connected by column grouting.

[0009] The technical solution of the present invention is: a cast stone railing for a bridge connected by grouting of columns, comprising columns and railings, wherein the columns are installed on a base, a mounting groove is provided on the top of the base, a cavity is provided inside the column, the bottom of the cavity is an open structure, concrete is cast inside the cavity and the mounting groove as a whole, and the concrete inside the cavity is not cast to the top of the column.

[0010] As a further improvement of the present invention, the height of the poured concrete inside the cavity is at least 1 / 2 of the height of the column.

[0011] As a further improvement of the present invention, a base longitudinal steel bar is provided in the base, and a base bending steel bar is provided outside the base longitudinal steel bar; a column embedded steel bar is provided in the column, and the column embedded steel bar is tied and fixed to the base longitudinal steel bar and the base bending steel bar.

[0012] As a further improvement of the present invention, a shear key is provided at the bottom of the installation notch.

[0013] As a further improvement of the present invention, a pouring port is provided at the top of the column, and concrete is poured through the pouring port.

[0014] A construction method for a bridge cast stone railing connected by grouting of columns, comprising the following steps: A. For existing bases, cut installation notches on the top of the base and form shear keys. When cutting, pay attention to retaining the longitudinal reinforcement and bending reinforcement of the base. For cast-in-place bases, reserve installation notches and form shear keys when pouring the base. B. Arrange the embedded steel bars of the columns at the installation notches and tie them together with the longitudinal steel bars and bending steel bars of the base; C. Hoist and splice the completed columns and guardrails, place the columns in the installation notches, ensure that the embedded steel bars of the columns are located inside the cavity and the shear keys are in the predetermined positions, and place temporary pads at the bottom of the guardrails for support and positioning; D. Install the template outside the installation notch, pour concrete into the cavity and the installation notch through the pouring port, and do not pour the concrete inside the cavity to the top of the column; E. After the concrete reaches the designed strength, remove the formwork outside the installation slot, remove the temporary pads, and seal the pouring port.

[0015] The beneficial effects of the present invention are: 1. The stone railing columns of the present invention adopt a cavity cast stone structure, which effectively reduces the deadweight of the stone railing, reduces the load on the bridge body, and has a favorable effect on the bridge structure.

[0016] 2. The present invention utilizes the pouring connection method at the top of the column to cast the railing column and the base as one body. Compared with the traditional "tenon connection", it has higher shear strength and bearing capacity, enhances the stability of the railing, and reduces the structural size of the base.

[0017] 3. The present invention increases the ductility and toughness of the column by arranging pre-embedded steel bars in the column, effectively exerts the material properties of steel bars and cast stones, and fully utilizes the materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a cast stone railing for a bridge connected by grouting of columns according to the present invention; Figure 2 A schematic diagram of the cross-sectional structure of the column and the base in the present invention; Figure 3 It is a structural schematic diagram of the installation slot in the invention.

[0019] Figure 4 The present invention is a schematic diagram of the planar structure of a cast stone bridge railing connected by grouting of columns.

[0020] In the figure: 1-column; 11-cavity; 12-concrete; 13-embedded steel bars for column; 14-casting port; 2-base; 21-longitudinal steel bars for base; 22-bending steel bars for base; 23-grooving line; 24-shear key; 25-installation notch; 3-guardrail; 4-temporary pad. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] A cast stone bridge railing connected by column grouting comprises a column 1 and a railing 3, wherein the column 1 is mounted on a base 2, and a mounting notch 25 ( Figure 3The dotted area in the figure is the installation slot 25). A through-length cavity 11 is provided inside the column 1. The bottom of the cavity 11 is an open structure. Concrete 12 is poured integrally inside the cavity 11 and the installation slot 25. The concrete 12 inside the cavity 11 is not poured to the top of the column 1.

[0023] The height of the poured concrete 12 inside the cavity 11 is at least 1 / 2 of the height of the column 1 .

[0024] A base longitudinal steel bar 21 is provided inside the base 2, and a base bending steel bar 22 is provided outside the base longitudinal steel bar 21; a column embedded steel bar 13 is provided inside the column 1, and the column embedded steel bar 13 is tied and fixed to the base longitudinal steel bar 21 and the base bending steel bar 22.

[0025] A shear key 24 is provided at the bottom of the mounting notch 25 .

[0026] A pouring port 14 is provided on the top of the column 1 , and concrete 12 is poured through the pouring port 14 .

[0027] Embodiment 1, In this embodiment, the concrete 12 is made of fine stone concrete.

[0028] The columns 1 and the balustrades 4 are prefabricated in a factory using cement, quartz sand, steel mesh and other materials in a certain proportion and cast in a mold (i.e., cast stone). Compared with natural stone, they have the advantages of long life, high plasticity and high strength.

[0029] The construction method is as follows: A. For the existing base 2, a slot line 23 is designed on the upper part of the base 2, and a cutting machine and an electric drill are used to cut an installation slot 25 along the slot line 23 on the top of the base 2 to form a shear key 24. When cutting, pay attention to retaining the base longitudinal steel bars 21 and the base bending steel bars 22. If the steel bars are damaged, they can be restored to equal strength. After cutting, the installation slot 25 needs to be cleaned; for the cast-in-place base 2, the installation slot 25 is reserved and the shear key 24 is formed when the base 2 is cast; B. Arrange the pre-buried steel bars 13 of the column at the installation notch 25, and tie and fix them with the longitudinal steel bars 21 of the base and the bending steel bars 22 of the base; C. Hoist the column 1 and the guardrail 3 assembled in the factory, place the column 1 at the installation notch 25, ensure that the embedded steel bars 13 of the column are located inside the cavity 11 and the shear key 24 is at the predetermined position, and place the temporary pad 4 at the bottom of the guardrail 3 for support and positioning; D. Install the template outside the installation notch 25, pour concrete 12 into the cavity 11 and the installation notch 25 through the pouring port 14, pour the concrete 12 to 1 / 2 of the height of the column 1, and do not need to pour to the top of the column 1, so as to reduce the deadweight of the handrail 1 as much as possible; after the concrete 12 is vibrated and compacted, it is cured; E. After the concrete 12 reaches the designed strength, remove the template outside the installation notch 25, remove the temporary pad 4, and seal the pouring port 14 with cement mortar.

[0030] This method constructs a cast stone bridge railing with column grouting connection that is easy to construct, simple in structure, safe and reliable, and low in cost. While meeting the landscape requirements, it effectively solves the problems of traditional stone railings such as excessive self-weight, heavy foundations, and unstable installation.

Claims

1. A cast stone bridge railing with column grouting connection, comprising a column (1) and a railing (3), wherein the column (1) is mounted on a base (2), and is characterized in that: A mounting notch (25) is provided at the top of the base (2), a cavity (11) is provided inside the column (1), the bottom of the cavity (11) is an open structure, concrete (12) is cast inside the cavity (11) and the mounting notch (25) as a whole, and the concrete (12) inside the cavity (11) is not cast to the top of the column (1).

2. A bridge cast stone railing connected by column grouting according to claim 1, characterized in that: The height of the poured concrete (12) inside the cavity (11) is at least 1 / 2 of the height of the column (1).

3. A bridge cast stone railing connected by column grouting according to claim 1 or 2, characterized in that: The base (2) is provided with a base longitudinal steel bar (21), and the base bending steel bar (22) is provided outside the base longitudinal steel bar (21); the column (1) is provided with a column embedded steel bar (13), and the column embedded steel bar (13) is tied and fixed to the base longitudinal steel bar (21) and the base bending steel bar (22).

4. The cast stone handrail for bridges connected by column grouting according to claim 3, characterized in that: A shear key (24) is provided at the bottom of the installation notch (25).

5. The cast stone handrail for bridges connected by column grouting according to claim 4, characterized in that: The top of the column (1) is provided with a pouring port (14), and concrete (12) is poured through the pouring port (14).

6. A construction method for a bridge cast stone railing connected by column grouting according to claim 5, characterized in that The following steps are involved: A. For an existing base (2), a mounting notch (25) is cut on the top of the base (2) to form a shear key (24). When cutting, care is taken to retain the base longitudinal reinforcement (21) and the base bending reinforcement (22); for a cast-in-place base (2), a mounting notch (25) is reserved when casting the base (2) to form a shear key (24); B. Arrange the pre-buried steel bars (13) of the column at the installation notch (25), and tie and fix them with the longitudinal steel bars (21) of the base and the bending steel bars (22) of the base; C. Hoisting and assembling the completed column (1) and guardrail (3), placing the column (1) in the installation notch (25), ensuring that the embedded steel bars (13) of the column are located inside the cavity (11) and the shear key (24) is located at a predetermined position, and placing a temporary pad (4) at the bottom of the guardrail (3) for support and positioning; D. Installing a template outside the installation notch (25), pouring concrete (12) into the cavity (11) and the installation notch (25) through the pouring opening (14), and the concrete (12) inside the cavity (11) is not poured to the top of the column (1); E. After the concrete (12) reaches the designed strength, the formwork outside the installation slot (25) is removed, the temporary pad (4) is removed, and the pouring port (14) is sealed.

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