CN217028931U - Steel pipe concrete support assembly - Google Patents

Abstract

The utility model relates to the field of support assemblies, in particular to a concrete-filled steel tube support assembly which comprises a plurality of steel tube support mechanisms, wherein the steel tube support mechanisms are connected through a beam assembly; the utility model discloses a concrete-filled steel tube supporting assembly, which makes full use of the excellent tensile strength, bending resistance and toughness of steel tubes and the compressive property of concrete materials to form a composite material supporting structure, and solves the problems that the common grid steel frame and the common section steel frame are insufficient in bearing capacity and easy to bend, destabilize, crush and the like; in addition, compared with other concrete-filled steel tube supports, the annular connecting device is used for connecting the adjacent butted steel tubes, so that the defects that the time consumption for installation is long, the installation precision is low, the joint performance is poor and the like when the adjacent butted steel tubes are connected by the traditional connecting modes such as welding, sleeves and flanges are overcome.

Description

A concrete-filled steel tube support assembly

technical field

The utility model relates to the field of support assemblies, in particular to a steel tube concrete support assembly.

Background technique

As a commonly used initial support structure in tunnel construction, steel frame support has been widely used in various special surrounding rock tunnels and submarine tunnels.

At present, the shotcrete support of the tunnel steel frame is mainly divided into two types: section steel frame and grid steel frame. Among them, the grid steel frame is made of steel bars and has a low bearing capacity; the section steel frame is made of I-beam or H-beam, etc. Processed, high bearing capacity.

However, with the development of underground geotechnical engineering such as tunnel engineering towards super deep burial, especially in the construction under extreme geological conditions such as high ground stress, the existing steel frame will cause serious deformation and damage, such as lateral loss of the steel frame. Stability, bending, twisting and joint crushing, etc.

Therefore, in order to ensure the internal support of the tunnel project, it is necessary to optimize the design of the existing support structure.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a support structure with high structural strength and excellent tensile and compressive properties.

In order to achieve the above purpose, the technical scheme adopted by the present utility model is:

A concrete-filled steel tube supporting assembly includes a plurality of supporting steel pipe mechanisms, and the plurality of supporting steel pipe mechanisms are connected by a beam assembly.

Each of the supporting steel pipe mechanisms includes an annular steel pipe filled with supporting concrete.

The adjacent supporting steel pipe mechanisms intersect or are distributed in parallel.

Each of the annular steel pipes includes a plurality of single arc-shaped pipes, which are connected end to end to form an annular structure; and each single arc-shaped pipe is filled with supporting concrete.

Any two intersecting single arc-shaped pipes in the two intersectingly arranged supporting steel pipe mechanisms are integral structures.

The adjacent butt-jointed single arc-shaped tubes are connected by a ring connecting device.

The annular connecting device includes a connecting sleeve, and the connecting sleeve is connected with the adjacent single arc-shaped pipe through bolts.

The connecting sleeve includes an outer casing.

The connecting sleeve further includes a dividing plate arranged on the inner wall of the outer casing; the dividing plate is located in the middle area of the through hole of the sleeve.

The connecting sleeve further comprises an inner sleeve body, the inner sleeve body and the outer sleeve body are coaxially distributed, and the inner sleeve body and the outer sleeve body are connected by a partition plate.

The advantages of the present utility model are:

The utility model discloses a concrete-filled steel tube supporting assembly. The supporting structure disclosed by the utility model makes full use of the excellent tensile strength, flexural resistance and toughness of steel pipes, as well as the compressive properties of concrete materials, to form a composite material supporting structure , to solve the problems of insufficient bearing capacity of ordinary grille steel frame and section steel frame, prone to bending, instability and crushing;

In addition, compared with other concrete-filled steel tubes, the utility model uses a circumferential connecting device to connect adjacent butt-jointed steel pipes, which overcomes the long installation time and low installation accuracy of traditional connection methods such as welding, sleeves and flanges to connect adjacent butt-jointed steel pipes. , poor joint performance and other shortcomings;

The connecting sleeve and the high-strength bolts used in the utility model are all prefabricated in the factory, and the connection can be completed only by tightening the bolts on site, and the joint has greater rigidity and strength;

In addition, the annular connection device disclosed by the utility model has the advantages of simple structure, quick and convenient construction, reliable connection, and can significantly improve the construction efficiency and connection quality of the concrete-filled steel tube connection.

Description of drawings

Below is a brief description of the content expressed in each of the accompanying drawings in the description of the present utility model and the marks in the figures:

FIG. 1 is a schematic structural diagram of the utility model when the first embodiment is adopted.

FIG. 2 is a schematic structural diagram of the utility model when the second embodiment is adopted.

FIG. 3 is a schematic structural diagram of the utility model when the adjacent single arc-shaped pipes are connected by the annular connecting device.

4 is a perspective view of a connecting sleeve in the annular connecting device of the present invention.

FIG. 5 is a top view of the connecting sleeve in the annular connecting device of the present invention.

FIG. 6 is a partial cross-sectional view of the connecting sleeve in the annular connecting device of the present invention.

The marks in the above figure are:

1-1. Supporting assembly, 1. Supporting steel pipe mechanism, 11. Single arc tube, 12. Circumferential connecting device, 12-1. Connecting sleeve, 121, Outer casing, 122, Separation plate, 123 , the inner sleeve body, 124, through the bolt hole; 2, the beam assembly.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and through the description of the preferred embodiments.

A concrete-filled steel tube supporting assembly includes a plurality of supporting steel tube mechanisms 1, and the plurality of said supporting steel tube mechanisms 1 are connected by a beam assembly 2; the utility model discloses a concrete-filled steel tube supporting assembly, which has the advantages of The supporting structure disclosed by the utility model makes full use of the excellent tensile strength, bending resistance and toughness of steel pipes, as well as the compressive properties of concrete materials, to form a composite material supporting structure, which solves the problem of insufficient bearing capacity of ordinary grid steel frames and profiled steel frames. , prone to bending, instability, crushing and other problems.

Specifically, the CFST supporting assembly 1-1 disclosed in the present invention mainly includes a plurality of supporting steel pipe mechanisms 1, and each supporting steel pipe mechanism 1 is equivalent to a set of supporting structures; the adjacent supporting steel pipes of the present utility model The mechanism 1 is connected to each other through the beam assembly 2, so that the whole supporting assembly 1-1 is more integrated, thereby ensuring the overall structural strength of the supporting assembly 1-1.

In addition, in the present invention, each of the supporting steel pipe mechanisms 1 includes a ring-shaped steel pipe, and the ring-shaped steel pipe is filled with supporting concrete; the ring-shaped steel pipe plays a supporting role, and in addition, the ring-shaped steel pipe is filled with support Concrete, the utility model can improve the overall rigidity and strength of the supporting steel pipe mechanism 1 and the supporting capacity of the supporting steel pipe mechanism 1 by using the annular steel pipe in combination with the supporting concrete.

Further, in the present invention, the adjacent supporting steel pipe mechanisms 1 intersect or are distributed in parallel; the adjacent supporting steel pipe mechanisms 1 of the present utility model adopt the method of intersecting or parallel distribution; the supporting steel pipe mechanisms 1 distributed in parallel are: In the normal arrangement of the support assembly 1-1, the intersecting support steel pipe mechanism 1 can increase the local structural strength and rigidity of the support assembly 1-1, and then can increase the local support strength in the tunnel, so that it can be adjusted according to needs. It is good to realize the support and protection of the overall tunnel by the support assembly 1-1.

Further, in the present invention, each of the annular steel pipes includes a plurality of single arc pipes 11, and the plurality of single arc pipes 11 are sequentially connected end to end to form a ring structure; each of the single arc pipes The shape pipes 11 are filled with supporting concrete; the design of the single arc-shaped pipe 11 facilitates the assembly of the annular steel pipe. production and use; in addition, in the present invention, the single arc-shaped tube 11 is a general structure, and the length of each single arc-shaped tube 11 can be selected according to needs. Arc and length can be designed as required.

Further, in the present invention, any two intersecting single arc-shaped pipes 11 in the two intersectingly arranged supporting steel pipe mechanisms 1 are integral structures; the integral structures here are also integrated structures, and here The intersecting two single arc-shaped tubes 11 are X-shaped from the top view; this arrangement is convenient for subsequent docking of other single-shaped arc-shaped tubes 11 ; in addition, the present invention requires two intersecting single arc-shaped tubes 11 The upper end surface does not have protrusions, that is, the upper end surface is flat when the two single arc tubes 11 intersect. This arrangement can avoid stacking the two single arc tubes 11 and affect the supporting effect.

Further, in the present invention, the adjacent butt-jointed single arc-shaped pipes 11 are connected by the annular connecting device 12; The connection facilitates the overall assembly and connection of the supporting steel pipe mechanism 1 .

Further, in the present invention, the annular connecting device 12 includes a connecting sleeve 12-1, the connecting sleeve 12-1 is connected with the adjacent single arc-shaped pipe 11 through bolts; the connecting sleeve 12-1 is sleeved The connection between the two butted single arc-shaped pipes 11 can be realized by matching bolts at the joint of the two butted single arc-shaped pipes 11 . In addition, in the present invention, the two butt-jointed single arc-shaped pipes 11 can be connected with each other. 11 is inserted into the connecting sleeve 12-1, so that the problem of misalignment of the single arc-shaped tube 11 can be avoided.

Further, in the present invention, the connecting sleeve 12-1 includes an outer casing 121; the outer casing 121 is an external support and limit structure, which facilitates the insertion and limitation of the single arc tube 11 and avoids two butt joints. The dislocation of the arc tube 11 also avoids the problem of dislocation and separation between the connecting sleeve 12-1 and the adjacent single arc tube 11; the outer casing 121 is provided with a sleeve through hole 1211; the sleeve through hole The 1211 provides a place for the insertion of adjacent single arc tubes 11 , and also facilitates the subsequent arrangement of the inner casing 123 and the partition plate 122 in the outer casing 121 .

Further, in the present invention, the connecting sleeve 12-1 also includes a partition plate 122 arranged on the inner wall of the outer casing 121; the arrangement of the partition plate 122 has a good axial limit function; The sleeve 12-1 slides along the adjacent single arc-shaped tubes 11, thereby avoiding the problem that the connecting sleeve 12-1 slides and cannot realize the stable connection between the adjacent single arc-shaped tubes 11; The partition plate 122 is located in the middle area of the sleeve through hole 1211; such an arrangement can make the upper and lower parts of the connecting sleeve 12-1 form a sink structure, which can be used for inserting the corresponding monomer arc pipe 11, so that the stability of the connection between the connecting sleeve 12-1 and the adjacent single arc-shaped pipe 11 can be well ensured.

Further, in the present invention, the connecting sleeve 12-1 further includes an inner sleeve body 123, the inner sleeve body 123 and the outer sleeve body 121 are coaxially distributed, and the inner sleeve body 123 and the outer sleeve body 121 pass through the partition plate 122 are connected; the inner sleeve body 123 plays an internal supporting and limiting role, the inner sleeve body 123 is located inside the single arc-shaped tube 11, and the inner sleeve body 123 acts as a connector structure. Based on this setting, it can be The stability of the connection between the connecting sleeve 12-1 and the adjacent single arc-shaped pipe 11 is better ensured.

Specific examples are as follows:

The shape of the neutral axis of each supporting steel pipe mechanism 1 disclosed in the present invention can be designed as required, and can be one of a circle, a multi-center circle, a horseshoe, and an ellipse. The cross-sectional profile remains the same.

Each supporting steel pipe mechanism 1 includes an annular steel pipe and supporting concrete; and the annular steel pipe includes a plurality of single arc pipes 11; .

The single arc-shaped tube 11 is a hollow circular tube, and its parameters such as outer diameter and wall thickness are determined according to the level of surrounding rock, the level of in-situ stress, and the like.

The single arc-shaped pipe 11 can be selected as a straight steel pipe (the arc is 0 degrees or 180 degrees) and a steel pipe with an arc, which is specifically determined according to the outline shape of the tunnel cavity.

In addition, in order to facilitate the connection between the single arc-shaped pipe 11 and the adjacent annular connecting device, through bolt holes 124 are distributed on the side walls of both ends of each single arc-shaped pipe 11 for adjacent single arc-shaped pipes 11. Connection between pipes 11.

Also, it should be noted here that the specification, quantity and distribution of the bolt holes on each single arc tube 11 are determined according to the use requirements; except for the small holes for connection, the wall of some single arc tubes 11 is specific There are also grouting holes and exhaust holes in the position.

The annular connecting device 12 includes a connecting sleeve 12-1 and a bolt.

The connecting sleeve 12-1 includes a partition plate 122 (an annular plate structure), an inner sleeve body 123 and an outer sleeve body 121; it can be considered that the H-shaped section is formed by rotating around its neutral axis.

The inner sleeve body 123 and the outer sleeve body 121 are distributed with through-bolt holes 124 arranged at intervals.

Insert the single arc tube 11 into the connecting sleeve 12-1, rotate the connecting sleeve 12-1 to align the connecting sleeve 12-1 with the bolt holes on the corresponding single arc tube 11, and then connect by bolts.

The connecting sleeve 12-1 can be in the shape of a straight line or a curve, that is, the connecting sleeve 12-1 can be a straight tube or an arc-shaped tube, which is determined according to the shape of the two single arc-shaped tubes 11 connected thereto.

In addition, in the present invention, the supporting concrete (that is, the pouring concrete) is the fine aggregate concrete with high fluidity and slight expansion.

There is also a longitudinal connection (beam assembly 2) between the above-mentioned supporting steel pipe mechanisms 1, so that each CFST forms a space frame structure, which can be deformed cooperatively and bear the overall force, thereby improving the longitudinal and diameter of the CFST support in the tunnel. Both have good load-bearing properties.

The longitudinal connection (beam assembly 2) adopts a thin single arc tube 11, and the two ends of the thin single arc tube 11 are respectively connected to two concrete-filled steel tubes by welding.

The thin single arc-shaped pipes 11 are arranged in parallel at a certain distance to connect multiple places of two adjacent concrete-filled steel tubes.

The inside of the thin monomer arc-shaped tube 11 can be filled with high fluidity, slightly expanded fine aggregate concrete or cement mortar and other slurries according to requirements.

A plurality of thin single arc tubes 11 can be further connected and strengthened by welding steel bars.

The construction method of the support assembly 1-1 disclosed by the utility model:

It mainly includes steps such as pre-assembly, hoisting and fixing, installation of longitudinal connection, grouting, and plugging.

Assembly:

It is to use the steel pipe connection sleeve 12-1 in advance to connect the multi-section steel pipes into a supporting steel pipe structure 1 on site or in the factory, which depends on the construction space and construction management method of the site.

Hoisting and fixing:

It is to use forklifts, cranes or special equipment to lift the supporting steel pipe mechanism 1 to a certain height, and use locking anchors to fix it on the surrounding rock surface, usually installed near the face of the tunnel.

To install the vertical link:

It is to connect the newly established supporting steel pipe mechanism 1 and the existing steel pipe by means of thin single arc pipe 11, steel bars, etc. in the form of welding.

Grouting:

It is to use grouting equipment to pour specific slurry into the corresponding steel pipe, usually injected from the lower grouting hole, so that the liquid level gradually rises until the grout fills the entire steel pipe. The feature is the top grouting hole or drain. There is slurry flowing out of the pores.

Blocking:

It is to close the open grouting hole or exhaust hole after the grouting is full.

In the present invention, each supporting steel pipe mechanism 1 is arranged at intervals along the longitudinal direction of the tunnel, usually the steel pipe concrete is perpendicular to the tunnel axis, and the adjacent supporting steel pipe mechanisms 1 are generally arranged approximately in parallel.

When the surrounding rock is poor and requires stronger support measures, methods such as reducing the spacing of concrete-filled steel tubes and improving various parameters of concrete-filled steel tubes can be adopted.

In particular, in the special construction position where the inclined shaft, the horizontal passage and the main hole intersect, the adjacent steel pipes can be arranged in an X-shaped cross.

The supporting assembly 1-1 disclosed by the utility model makes full use of the excellent tensile strength, flexural resistance and toughness of steel pipes, as well as the compressive resistance of concrete materials, to form a composite material supporting structure, which solves the problem of common grid steel frame and profile steel. The steel frame has insufficient bearing capacity and is prone to problems such as bending, instability and crushing.

Compared with other concrete-filled steel tube supports, the utility model uses the annular connecting device 12 to connect, which overcomes the shortcomings of traditional connection methods such as welding, connecting sleeve 12-1 and flanges, such as long installation time, low installation accuracy, and poor joint performance.

The connecting sleeve 12-1 and the high-strength bolts used in the present invention are all prefabricated in the factory, and the connection can be completed only by tightening the bolts on site, so that the joint has greater rigidity and strength. The annular connection device 12 has the characteristics of simple structure, quick and convenient construction, reliable connection, and can significantly improve the construction efficiency and connection quality of the concrete-filled steel tube connection.

Obviously, the specific implementation of the present invention is not limited by the above-mentioned methods, as long as various insubstantial improvements made by the method concept and technical solution of the present invention are adopted, they are all within the protection scope of the present invention.

Claims (7)

1. A concrete-filled steel tube supporting assembly is characterized by comprising a plurality of supporting steel tube mechanisms, wherein the supporting steel tube mechanisms are connected through a beam assembly; each supporting steel pipe mechanism comprises an annular steel pipe, and supporting concrete is filled in the annular steel pipe; the adjacent supporting steel pipe mechanisms are intersected or distributed in parallel; any two intersected single arc-shaped pipes in the two intersected supporting steel pipe mechanisms are of an integral structure; the horizontal projection of the two intersected single arc-shaped tubes is in an X shape; the upper end surface of the intersection of the two single arc-shaped pipes is a flat front surface.

2. The concrete-filled steel tube support assembly according to claim 1, wherein each annular steel tube comprises a plurality of single arc-shaped tubes, and the single arc-shaped tubes are sequentially connected end to form an annular structure; and supporting concrete is filled in each single arc-shaped pipe.

3. A concrete filled steel tube support assembly according to any one of claims 1-2, wherein adjacent abutting single arc-shaped tubes are connected by a circumferential connecting device.

4. The concrete filled steel tube support assembly according to claim 3, wherein the circumferential connecting device comprises a connecting sleeve, and the connecting sleeve is connected with the adjacent single arc-shaped tubes through bolts.

5. A concrete filled steel tube support assembly according to claim 4, wherein said connection sleeve comprises an outer sleeve body; the outer sleeve body is provided with a sleeving through hole.

6. The concrete-filled steel tube support assembly according to claim 5, wherein the connecting sleeve further comprises a partition plate arranged on the inner wall of the outer sleeve body; the partition plate is positioned in the middle area of the sleeve joint through hole.

7. The concrete-filled steel tube support assembly according to claim 6, wherein the connecting sleeve further comprises an inner sleeve body, the inner sleeve body and the outer sleeve body are coaxially distributed, and the inner sleeve body and the outer sleeve body are connected through a partition plate.

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