CN-121976636-A - Steel-wood concrete combined column and construction method thereof

CN121976636ACN 121976636 ACN121976636 ACN 121976636ACN-121976636-A

Abstract

The invention relates to a steel-wood concrete combined column and a construction method thereof, which are used for solving the technical problem that the mechanical property and the subsequent service performance of the wood core combined column are obviously affected due to the fact that a wood core is directly hydraulically jacked into a steel pipe. The wooden core is positioned in the steel pipe, the diameter is smaller than the inner diameter of the steel pipe, the wooden core is formed by splicing a plurality of vertical wooden strips in the horizontal direction, an arc-shaped groove is formed at one end of each vertical wooden strip close to the center of the wooden core, the arc-shaped grooves of each vertical wooden strip are spliced into a cylindrical propping cavity, the inner pipe is coaxially inserted in the propping cavity, a plurality of long holes are uniformly distributed on the pipe wall of the inner pipe, levers are respectively hinged in the long holes, one end of each lever is positioned in the inner pipe, the other end of each lever penetrates through the long holes to be hinged with a propping block, the propping blocks are positioned between the inner pipe and the cavity wall of the propping cavity, the cam shaft is coaxially inserted in the inner pipe, the cam shaft comprises a plurality of protruding parts, the cam shaft is rotated to enable the protruding parts to stir the levers to rotate so as to drive the propping blocks to tightly prop against the cavity wall of the propping cavity, and each vertical wooden strip is tightly propped against the inner wall of the steel pipe radially outwards.

Inventors

ZHOU CHAOFENG
Fu Kaihe
PANG RUI
ZHU YAN
LI YADONG
Dang Longji

Assignees

河南工业大学

Dates

Publication Date: 20260505
Application Date: 20260212

Claims (9)

1. Steel-wood concrete composite column, its characterized in that includes: A steel pipe; the concrete layer is coaxially sleeved outside the steel pipe and is formed by casting concrete; the wood core is positioned in the steel pipe, the diameter of the wood core is smaller than the inner diameter of the steel pipe, the wood core is formed by splicing a plurality of vertical wood strips in the horizontal direction, an arc-shaped groove is formed at one end of each vertical wood strip, which is close to the center of the wood core, and the arc-shaped grooves of each vertical wood strip are spliced into a cylindrical jacking cavity; The inner tube is coaxially inserted in the jacking cavity, a plurality of long holes are uniformly distributed on the tube wall of the inner tube, levers are respectively hinged in the long holes, one end of each lever is positioned in the inner tube, the other end of each lever penetrates through the long holes to be hinged with a jacking block, and the jacking block is positioned between the inner tube and the cavity wall of the jacking cavity; The cam shaft is coaxially inserted into the inner pipe, the periphery of the cam shaft comprises a plurality of protruding parts, and the cam shaft is rotated to enable the protruding parts to stir the lever to rotate so as to drive the jacking block to tightly press on the cavity wall of the jacking cavity, and each vertical wood strip is tightly pressed on the inner wall of the steel pipe in the radial direction outwards.
2. The steel-wood concrete composite column according to claim 1, wherein the wood core is formed by splicing three vertical wood strips, the long holes are uniformly distributed in three rows in the circumferential direction of the inner tube, the levers corresponding to the long holes in each row are connected to the same long-strip-shaped top supporting block, and the cam shaft is uniformly distributed in the circumferential direction.
3. The steel and wood concrete composite post of claim 1 wherein the corresponding diameter of the boss increases against the direction of rotation of the camshaft.
4. The steel and wood concrete composite post of claim 1 wherein the lever comprises two sections, the angle between the two sections being an obtuse angle.
5. The steel and wood concrete composite post of claim 1 wherein the outer surface of the top brace is arcuate.
6. The steel and wood concrete composite post of claim 1 wherein the outer surface of the top brace has a plurality of spikes.
7. The steel and wood concrete composite column of claim 1 wherein the inner surface of the steel tube has a plurality of spikes.
8. The steel and wood concrete composite column of claim 1 wherein the concrete layer is poured from ultra-high performance concrete.
9. The method of constructing a steel and wood concrete composite post according to any one of claims 1-8, comprising the steps of: s10, assembling a plurality of vertical wood strips in the steel pipe to form a wood core; S20, inserting the cam shaft into the inner pipe and inserting the cam shaft into a top support cavity in the middle of the wood core; s30, driving the cam shaft to rotate by a set angle through manual or rotary equipment so that the bulge part of the cam shaft can stir the corresponding lever to tightly prop the propping block against the cavity wall of the propping cavity; s40, coaxially supporting a die outside the steel pipe, pouring concrete in the die to form a concrete layer, and removing the die after solidification.

Description

Steel-wood concrete combined column and construction method thereof Technical Field The invention relates to a steel-wood concrete composite column and a construction method thereof. Background With the continuous development of the technology in the field of building engineering, the requirements of modern buildings on the weight reduction and the bearing efficiency of the support columns are higher and higher. The traditional concrete filled steel tube column has high bearing capacity, but has larger dead weight, and the exposed steel tube is easy to rust in a corrosive environment, has poorer fire resistance and higher carbon discharge in the production process. The wood structure has the advantages of environmental protection, low carbon and light weight, but has insufficient bearing capacity under pressure and shearing resistance in high-rise buildings. In the prior art, in order to reduce dead weight by filling wood into a steel pipe, in order to tightly attach and bond the wood and the steel pipe, the wood with the outer diameter slightly larger than the inner diameter of the steel pipe is generally required to be directly pushed into the steel pipe by a hydraulic mechanism, and the mode can obviously influence the mechanical property and the subsequent use performance of the wood core combined column, specifically: 1. The wood itself is damaged, and the bearing capacity is reduced, namely, the wood needs to bear larger extrusion force and friction force in the jacking process of the hydraulic press, and surface indentation, microcrack and even partial splitting (especially for small-diameter wood or wood with uneven materials) are easy to cause. These damages impair the compressive strength of wood (which is the core property of wood as a structural material), resulting in failure of the wood core to fully exert a synergistic load-bearing effect and even becoming a weak link of the composite column. 2. The interface combination is not tight, the load transmission efficiency is low, and the contact surface of the wood and the inner wall of the steel pipe needs to have enough bonding strength to realize cooperative work. When hydraulic pressure is jacked, the wood and the inner wall of the steel pipe are easy to slide relatively, so that mechanical biting force and friction force between interfaces are reduced. In addition, impurities such as wood dust and dust on the surface of the wood in the jacking process pollute the interface, and further weaken the bonding effect. The loose interface bonding can lead to the fact that the load cannot be effectively transferred from the wood to the steel pipe, so that the overall bearing capacity of the combined column is reduced. 3. Uneven stress distribution, local instability is caused, and the anisotropy of wood (large difference of compressive strength between the cis-grain and the transverse-grain) can cause uneven stress distribution in the jacking process. For example, the compressive strength in the grain-oriented direction is high, but the transverse grain direction is low, and the extrusion force during jacking may cause the wood to locally flex in the transverse grain direction, thereby affecting the overall stability of the composite column. 4. The creep is aggravated under long-term load and the deformation increases, wood is a typical viscoelastic material, and creep (deformation increases with time) occurs under long-term load. Wood damage (e.g., microcracks) caused by hydraulic jacking can accelerate the creep process, increase long-term deformation of the composite column, and affect the applicability and durability of the structure. 5. The construction quality is difficult to control, the later maintenance cost is increased, the position and the verticality of the wood are difficult to accurately control in the hydraulic jacking process, the axial line of the wood core and the steel pipe is easy to deviate, and the stress performance of the combined column is influenced. In addition, the wood position is difficult to fix after being jacked in, and measures (such as bolt fixing) are needed to be additionally taken, so that the construction difficulty and the construction cost are increased. If the construction quality does not reach the standard, reinforcement or repair is needed in the later stage, and the maintenance cost is further increased. Disclosure of Invention The invention aims to provide a steel-wood concrete composite column and a construction method thereof, which are used for solving the technical problem that the mechanical property and the subsequent use performance of the wood core composite column are obviously affected due to the fact that the wood core of the existing composite column is directly and hydraulically jacked into a steel pipe. The steel-wood concrete composite column comprises the following technical scheme: A steel pipe; the concrete layer is coaxially sleeved outside the steel pipe and is formed by casting conc