CN108252425B - Steel pipe confined concrete node structure, corresponding truss structure and construction method - Google Patents
Steel pipe confined concrete node structure, corresponding truss structure and construction method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 151
- 239000010959 steel Substances 0.000 title claims abstract description 151
- 239000004567 concrete Substances 0.000 title claims abstract description 70
- 238000010276 construction Methods 0.000 title claims abstract description 11
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 21
- 230000002787 reinforcement Effects 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 6
- 238000009415 formwork Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
本发明涉及一种钢管约束混凝土节点结构，包括弦杆与腹杆，所述弦杆与腹杆均包括钢管与钢筋网架，所述钢筋网架的一端均经普通混凝土预埋在钢管内、另一端均延伸出钢管外部，所述弦杆与腹杆之间经外部的钢筋网架相互连接，连接处浇筑有超高性能混凝土，结构简单，具有承载能力高，施工较为简单的优点，且克服了钢管混凝土桁架节点相贯处因相邻钢管焊接引起钢管疲劳的缺点。
The invention relates to a steel tube restrained concrete node structure, which includes chord bars and web bars. The chord bars and web bars each include a steel pipe and a steel bar grid. One end of the steel bar grid is pre-embedded in the steel pipe through ordinary concrete. The other ends extend out of the steel pipe. The chords and webs are connected to each other through an external steel mesh frame. Ultra-high performance concrete is poured at the connection. The structure is simple, has the advantages of high load-bearing capacity and relatively simple construction. It overcomes the shortcomings of steel pipe fatigue caused by the welding of adjacent steel pipes at the intersections of concrete-filled steel tube truss nodes.
Description
技术领域Technical field
本发明涉及一种钢管约束混凝土节点结构及相应桁架结构与施工方法。The invention relates to a steel tube restrained concrete node structure, a corresponding truss structure and a construction method.
背景技术Background technique
钢管混凝土是指在钢管中填充混凝土而形成的构件，通常，钢管与其内部的核心混凝土共同承受外界荷载，能够相互弥补钢管与混凝土各自单独使用时的缺点。钢管混凝土常以桁架的形式应用在大跨空间结构和桥梁中，作为钢管混凝土桁架体系，常见形式有平面或空间的K、T、X、Y、N型钢管混凝土节点，其中在桁架结构中数K型节点最为常见。在钢管混凝土桁架结构的节点处，在支、主管连接的相贯线上，由于几何形状发生突变，且存在节点处相邻钢管之间的焊接缺陷和焊接残余拉应力，管节点相贯线附近常出现很高的应力集中，易引起疲劳裂纹的发生和发展，降低管节点以及整个桁架结构对交变荷载的抵抗能力。在日常疲劳荷载作用下钢管混凝土桁架节点容易开裂，疲劳裂纹起源于高应力区的初始缺陷处，在“热点”附近由表面裂纹扩展并穿透管壁，逐步扩展而使节点破坏，导致整个桁架结构承载力的丧失。Steel tube concrete refers to a component formed by filling concrete in a steel tube. Usually, the steel tube and the core concrete inside jointly bear external loads, which can make up for each other's shortcomings when the steel tube and concrete are used alone. Concrete-filled steel tubes are often used in long-span space structures and bridges in the form of trusses. As a concrete-filled steel tube truss system, common forms include K, T, K-type nodes are the most common. At the nodes of the concrete-filled steel tube truss structure, on the intersecting line where the branches and main pipes are connected, due to sudden changes in the geometric shape and the existence of welding defects and welding residual tensile stress between adjacent steel pipes at the nodes, near the intersection line of the pipe nodes High stress concentrations often occur, which can easily cause the occurrence and development of fatigue cracks and reduce the resistance of pipe nodes and the entire truss structure to alternating loads. Under daily fatigue loads, concrete-filled steel tube truss nodes are prone to cracking. Fatigue cracks originate from initial defects in high-stress areas. Surface cracks expand near the "hot spot" and penetrate the pipe wall. They gradually expand and destroy the nodes, resulting in the entire truss. Loss of structural bearing capacity.
发明内容Contents of the invention
鉴于现有技术的不足，本发明所要解决的技术问题是提供一种钢管约束混凝土节点结构及相应桁架结构与施工方法，不仅结构简单，而且便捷高效。In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a steel tube restrained concrete node structure and a corresponding truss structure and construction method, which are not only simple in structure, but also convenient and efficient.
为了解决上述技术问题，本发明的技术方案是：一种钢管约束混凝土节点结构，包括弦杆与腹杆，所述弦杆与腹杆均包括钢管与钢筋网架，所述钢筋网架的一端均经普通混凝土预埋在钢管内、另一端均延伸出钢管外部，所述弦杆与腹杆之间经外部的钢筋网架相互连接，连接处浇筑有超高性能混凝土。In order to solve the above technical problems, the technical solution of the present invention is: a steel tube restrained concrete node structure, including chord bars and web bars. Both the chord bars and the web bars include steel tubes and steel bar grids. One end of the steel bar grids They are all pre-embedded in the steel pipe with ordinary concrete, and the other end extends out of the steel pipe. The chord rod and the web rod are connected to each other through an external steel mesh frame, and ultra-high performance concrete is poured at the connection.
优选的，所述钢筋网架均包括若干根纵筋，若干根纵筋经若干根箍筋绑扎为一体；其中弦杆的钢管内预埋的纵筋长度为2-3倍的弦杆钢管内混凝土截面直径、伸出钢管外的纵筋长度为节点主管长度；其中腹杆的钢管内预埋的纵筋长度为2-3倍的腹杆钢管内混凝土截面直径、伸出钢管外的纵筋长度为节点支管长度；所述腹杆的纵筋在弦杆的纵筋上的锚固长度不小于腹杆的纵筋直径的12倍。Preferably, the steel grid includes several longitudinal bars, which are bound together by several stirrups; the length of the longitudinal bars embedded in the steel pipe of the chord is 2-3 times that of the steel pipe of the chord. The diameter of the concrete section and the length of the longitudinal bars protruding out of the steel pipe are the length of the node main pipe; the length of the longitudinal bars embedded in the steel pipe of the web rod is 2-3 times the diameter of the concrete section in the web rod steel pipe and the length of the longitudinal bars protruding out of the steel pipe. The length is the length of the node branch pipe; the anchoring length of the longitudinal bars of the web rod on the longitudinal bars of the chord bar is not less than 12 times the diameter of the longitudinal bars of the web bar.
优选的，所述弦杆与腹杆的数量均为两根，两弦杆位于节点主管所在直线上，两腹杆位于节点支管所在斜线上，所述弦杆与腹杆外部的钢筋网架相互连接并经超高性能混凝土浇筑为倒“K”形的节点结构。Preferably, the number of the chord bars and web bars is two, the two chord bars are located on the straight line where the node main pipe is located, the two web bars are located on the diagonal line where the node branch pipe is located, and the steel mesh frame outside the chord bar and web bar The nodes are connected to each other and cast into an inverted "K" shape by ultra-high performance concrete.
一种钢管约束混凝土相应桁架结构，包括若干个倒“K”形的钢管约束混凝土节点结构，其中左右相邻的钢管约束混凝土节点结构的弦杆之间连接为一体的直线形，上下相邻的钢管约束混凝土节点结构的腹杆之间连接为一体的斜线形，组成具有相互平行的上下弦杆以及位于上下弦杆之间的若干根波浪状腹杆的桁架结构。A steel tube confined concrete corresponding truss structure, including several inverted "K" shaped steel tube confined concrete node structures, in which the chords of the adjacent left and right steel tube confined concrete node structures are connected in an integrated straight line, and the adjacent upper and lower chords are The web members of the steel tube restrained concrete node structure are connected in a diagonal shape to form a truss structure with mutually parallel upper and lower chords and several wavy web members located between the upper and lower chords.
优选的，左右相邻的钢管约束混凝土节点结构的弦杆的钢管制作为一体，供相邻的弦杆共用；上下相邻的钢管约束混凝土节点结构的腹杆的钢管制作为一体，供相邻的腹杆共用。Preferably, the steel pipes of the chords of the left and right adjacent steel pipes constraining the concrete node structure are integrated into one body, and are shared by the adjacent chords; The belly rods are shared.
一种钢管约束混凝土节点结构的施工方法，按以下步骤进行：（1）弦杆以及腹杆部分在浇筑完成后运至施工现场；（2）通过“K”形的UHPC现浇节点模具，将弦杆和腹杆固定在模具内相应位置，通过模具的浇筑孔往模具内部进行UHPC浇筑；（3）常温养护28天后，拆除模具，形成采用UHPC现浇的钢管约束混凝土节点。A construction method for a steel tube-constrained concrete joint structure is carried out according to the following steps: (1) The chord and web parts are transported to the construction site after the pouring is completed; (2) The "K"-shaped UHPC cast-in-place joint mold is used to The chords and webs are fixed at corresponding positions in the mold, and UHPC is poured into the interior of the mold through the pouring holes of the mold; (3) After curing at room temperature for 28 days, the mold is dismantled to form steel tube-constrained concrete nodes cast in situ using UHPC.
优选的，在步骤（1）中，弦杆以及腹杆在制作时，将纵筋用箍筋绑扎固定，绑扎的位置于钢管管口1/3-1/2处，放置于钢管之中，在钢管内浇筑普通混凝土，凝固后拆模，进行28天常温养护，弦杆的钢管内预埋的纵筋长度为2-3倍的弦杆钢管内混凝土截面直径、伸出钢管外的纵筋长度为节点主管长度；腹杆的钢管内预埋的纵筋长度为2-3倍的腹杆钢管内混凝土截面直径、伸出钢管外的纵筋长度为节点支管长度，腹杆的纵筋在弦杆的纵筋上的锚固长度不小于腹杆的纵筋直径的12倍。Preferably, in step (1), when the chord bars and web bars are being made, the longitudinal bars are bound and fixed with stirrups. The binding position is at 1/3-1/2 of the opening of the steel pipe and placed in the steel pipe. Pour ordinary concrete in the steel pipe, remove the formwork after solidification, and maintain it at room temperature for 28 days. The length of the longitudinal bars embedded in the steel pipe of the chord is 2-3 times the cross-sectional diameter of the concrete in the chord steel pipe, and the length of the longitudinal bars extending outside the steel pipe. The length is the length of the node main pipe; the length of the longitudinal reinforcement embedded in the steel pipe of the web rod is 2-3 times the concrete cross-sectional diameter in the web rod steel pipe, and the length of the longitudinal reinforcement extending out of the steel pipe is the length of the node branch pipe. The longitudinal reinforcement of the web rod is at The anchoring length of the longitudinal reinforcement of the chord bar shall not be less than 12 times the diameter of the longitudinal reinforcement of the web bar.
优选的，在步骤（2）中，所述模具由“K”形的左半边钢模与“K”形的右半边钢模组成，所述左半边钢模与右半边钢模之间经螺栓相互螺接，组合成内部空心的“K”形模具，所述模具周部开设有通向节点的浇筑孔，所述模具在形成节点支管的钢模周部开设有排气通孔；所述模具的管长均大于节点主管与节点支管的长度。Preferably, in step (2), the mold is composed of a "K"-shaped left half steel mold and a "K"-shaped right half steel mold, with bolts between the left half steel mold and the right half steel mold. They are screwed together to form a hollow "K"-shaped mold. The mold is provided with pouring holes leading to the nodes at the periphery. The mold is provided with exhaust holes at the periphery of the steel mold forming the node branch pipes; The pipe length of the mold is greater than the length of the node main pipe and the node branch pipe.
优选的，在步骤（2）中，为方便脱模，在模具内部刷上一层机油。Preferably, in step (2), in order to facilitate demoulding, a layer of machine oil is brushed inside the mold.
与现有技术相比，本发明具有以下有益效果：（1）承载能力大幅提高，塑性增大，力学性能可靠。（2）节点不需要现场进行相邻钢管的焊接，而是浇筑混凝土连接，避免产生钢管混凝土桁架节点相贯处因焊接引起的钢管疲劳现象，产生裂纹，影响节点的受力性能。Compared with the existing technology, the present invention has the following beneficial effects: (1) The bearing capacity is greatly improved, the plasticity is increased, and the mechanical properties are reliable. (2) The nodes do not require on-site welding of adjacent steel pipes, but concrete connections are poured to avoid fatigue of steel pipes caused by welding at the intersections of concrete-filled steel tube truss nodes, resulting in cracks and affecting the mechanical performance of the nodes.
下面结合附图和具体实施方式对本发明做进一步详细的说明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
附图说明Description of the drawings
图1为钢管约束混凝土节点结构的构造示意图。Figure 1 is a schematic structural diagram of a steel tube confined concrete node structure.
图2为钢管约束混凝土相应桁架结构的构造示意图。Figure 2 is a schematic structural diagram of the corresponding truss structure of steel tube confined concrete.
图3为弦杆的构造示意图。Figure 3 is a schematic diagram of the chord structure.
图4为腹杆的构造示意图。Figure 4 is a schematic diagram of the structure of the web rod.
图5为左半边钢模的构造示意图。Figure 5 is a schematic structural diagram of the left half of the steel mold.
图6为模具的构造示意图。Figure 6 is a schematic structural diagram of the mold.
图7为模具的使用状态示意图。Figure 7 is a schematic diagram of the mold in use.
具体实施方式Detailed ways
为让本发明的上述特征和优点能更明显易懂，下文特举实施例，并配合附图，作详细说明如下。In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, embodiments are given below and described in detail with reference to the accompanying drawings.
如图1-7所示，一种钢管约束混凝土节点结构，包括弦杆1与腹杆2，所述弦杆与腹杆均包括钢管3与钢筋网架，所述钢筋网架的一端均经普通混凝土4预埋在钢管内、另一端均延伸出钢管外部，所述弦杆与腹杆之间经外部的钢筋网架相互连接，连接处浇筑有超高性能混凝土5。As shown in Figure 1-7, a steel tube restrained concrete node structure includes a chord 1 and a web 2. The chords and webs each include a steel tube 3 and a steel grid. One end of the steel grid is Ordinary concrete 4 is embedded in the steel pipe, and the other end extends out of the steel pipe. The chord rod and the web rod are connected to each other through an external steel mesh frame, and ultra-high performance concrete 5 is poured at the connection.
在本发明实施例中，所述钢筋网架均包括若干根纵筋6，若干根纵筋经若干根箍筋7绑扎为一体，节点处采用纵筋及箍筋加密，减少UHPC受拉裂缝的产生；其中弦杆的钢管内预埋的纵筋长度为2-3倍的弦杆钢管内混凝土截面直径、伸出钢管外的纵筋长度为节点主管长度；其中腹杆的钢管内预埋的纵筋长度为2-3倍的腹杆钢管内混凝土截面直径、伸出钢管外的纵筋长度为节点支管长度；所述腹杆的纵筋在弦杆的纵筋上的锚固长度不小于腹杆的纵筋直径的12倍。In the embodiment of the present invention, the steel mesh frame includes a number of longitudinal bars 6, which are bound together by a number of stirrups 7. The longitudinal bars and stirrups are encrypted at the nodes to reduce the possibility of UHPC tension cracks. Produced; the length of the longitudinal bars embedded in the steel tube of the chord is 2-3 times the cross-sectional diameter of the concrete in the chord steel tube, and the length of the longitudinal bars extending outside the steel tube is the length of the node main tube; among them, the length of the longitudinal bars embedded in the steel tube of the web The length of the longitudinal bars is 2-3 times the cross-sectional diameter of the concrete in the web steel tube, and the length of the longitudinal bars extending outside the steel tube is the length of the node branch pipe; the anchoring length of the longitudinal bars of the web bar on the longitudinal bars of the chord is not less than the length of the web 12 times the diameter of the longitudinal reinforcement of the rod.
在本发明实施例中，所述弦杆与腹杆的数量均为两根，两弦杆位于节点主管所在直线上，两腹杆位于节点支管所在斜线上，所述弦杆与腹杆外部的钢筋网架相互连接并经超高性能混凝土浇筑为倒“K”形的节点结构。In the embodiment of the present invention, the number of the chord bars and the web bars is two. The two chord bars are located on the straight line where the node main pipe is located, and the two web bars are located on the diagonal line where the node branch pipe is located. The chord bar and the web bar are outside The steel grids are connected to each other and cast with ultra-high performance concrete into an inverted "K"-shaped node structure.
一种钢管约束混凝土相应桁架结构，包括若干个倒“K”形的钢管约束混凝土节点结构，其中左右相邻的钢管约束混凝土节点结构的弦杆之间连接为一体的直线形，上下相邻的钢管约束混凝土节点结构的腹杆之间连接为一体的斜线形，组成具有相互平行的上下弦杆以及位于上下弦杆之间的若干根波浪状腹杆的桁架结构。A steel tube confined concrete corresponding truss structure, including several inverted "K" shaped steel tube confined concrete node structures, in which the chords of the adjacent left and right steel tube confined concrete node structures are connected in an integrated straight line, and the adjacent upper and lower chords are The web members of the steel tube restrained concrete node structure are connected in a diagonal shape to form a truss structure with mutually parallel upper and lower chords and several wavy web members located between the upper and lower chords.
在本发明实施例中，左右相邻的钢管约束混凝土节点结构的弦杆的钢管制作为一体，供相邻的弦杆共用；上下相邻的钢管约束混凝土节点结构的腹杆的钢管制作为一体，供相邻的腹杆共用。In the embodiment of the present invention, the steel pipes of the left and right adjacent steel pipes constraining the chords of the concrete node structure are integrated into one body and are shared by the adjacent chords; the steel pipes of the upper and lower adjacent steel pipes constraining the web members of the concrete node structure are integrated into one body. , shared by adjacent web rods.
一种钢管约束混凝土节点结构的施工方法，按以下步骤进行：（1）弦杆以及腹杆部分在浇筑完成后运至施工现场；（2）通过“K”形的UHPC现浇节点模具8，将弦杆和腹杆固定在模具内相应位置，通过模具的浇筑孔往模具内部进行UHPC浇筑；（3）浇筑完成待UHPC凝固后，常温养护28天后，拆除模具，形成采用UHPC现浇的钢管约束混凝土节点。A construction method for a steel tube-constrained concrete joint structure, which is carried out according to the following steps: (1) The chord and web parts are transported to the construction site after the pouring is completed; (2) Through the "K"-shaped UHPC cast-in-place joint mold 8, Fix the chord and web bars at the corresponding positions in the mold, and pour UHPC into the interior of the mold through the pouring hole of the mold; (3) After the pouring is completed and the UHPC solidifies, after curing at room temperature for 28 days, the mold is removed to form a UHPC cast-in-place steel pipe. Constrained concrete joints.
在本发明实施例中，在步骤（1）中，弦杆以及腹杆在制作时，将纵筋用箍筋绑扎固定，绑扎的位置于钢管管口1/3-1/2处，放置于钢管之中，纵筋和箍筋主要用来加固钢管约束混凝土腹杆和弦杆与现浇UHPC节点之间的粘结；在钢管内浇筑普通混凝土，凝固后拆模，进行28天常温养护，弦杆的钢管内预埋的纵筋长度为2-3倍的弦杆钢管内混凝土截面直径、伸出钢管外的纵筋长度为节点主管长度；腹杆的钢管内预埋的纵筋长度为2-3倍的腹杆钢管内混凝土截面直径、伸出钢管外的纵筋长度为节点支管长度，腹杆的纵筋在弦杆的纵筋上的锚固长度不小于腹杆的纵筋直径的12倍。In the embodiment of the present invention, in step (1), when the chord bars and web bars are being produced, the longitudinal bars are bound and fixed with stirrups. The binding position is at 1/3-1/2 of the steel pipe opening and is placed on Among the steel pipes, longitudinal bars and stirrups are mainly used to strengthen the bond between the steel pipe restrained concrete webs and chords and the cast-in-place UHPC nodes; ordinary concrete is poured into the steel pipe, and after solidification, the formwork is removed and cured at room temperature for 28 days. The length of the longitudinal bars embedded in the steel tube of the pole is 2-3 times the cross-sectional diameter of the concrete in the chord steel tube, and the length of the longitudinal bars extending outside the steel tube is the length of the node main tube; the length of the longitudinal bars embedded in the steel tube of the web pole is 2 -3 times the diameter of the concrete section in the web steel tube and the length of the longitudinal bars extending outside the steel tube is the length of the node branch pipe. The anchoring length of the longitudinal bars of the web bar on the longitudinal bars of the chord bar is not less than 12 times the diameter of the longitudinal bars of the web bar. times.
在本发明实施例中，在步骤（2）中，模具根据钢管约束混凝土K形节点相贯处形状与大小预制，所述模具由结构相同的“K”形的左半边钢模9与“K”形的右半边钢模10组成，所述左半边钢模与右半边钢模之间经螺栓11相互螺接，组合成内部空心的“K”形模具，所述模具周部开设有通向节点的浇筑孔13，进行UHPC浇筑，所述模具在形成节点支管的钢模周部开设有排气通孔12，方便浇筑UHPC时模具内气体排出，该模具可重复利用；所述模具的管长均大于节点主管与节点支管的长度，方便将其固定在弦杆和腹杆上。In the embodiment of the present invention, in step (2), the mold is prefabricated according to the shape and size of the intersection of the K-shaped node of the steel tube-constrained concrete. The mold is composed of the left half steel mold 9 of the "K" shape with the same structure and the "K" shape. ”-shaped right half steel mold 10, the left half steel mold and the right half steel mold are screwed to each other through bolts 11, and are combined into a hollow "K" shaped mold. The pouring hole 13 of the node is used for UHPC pouring. The mold is provided with an exhaust through hole 12 around the steel mold forming the node branch pipe to facilitate the gas discharge in the mold when pouring UHPC. The mold can be reused; the pipe of the mold The length is greater than the length of the node main pipe and the node branch pipe, making it easy to fix them on the chord and web rods.
在本发明实施例中，在步骤（2）中，为方便脱模，在模具内部刷上一层机油。In the embodiment of the present invention, in step (2), in order to facilitate demoulding, a layer of machine oil is brushed inside the mold.
本发明不局限于上述最佳实施方式，任何人在本发明的启示下都可以得出其他各种形式的钢管约束混凝土节点结构及相应桁架结构与施工方法。凡依本发明申请专利范围所做的均等变化与修饰，皆应属本发明的涵盖范围。The present invention is not limited to the above-mentioned preferred embodiments. Under the inspiration of the present invention, anyone can derive various other forms of steel tube confined concrete node structures and corresponding truss structures and construction methods. All equivalent changes and modifications made in accordance with the patentable scope of the present invention shall fall within the scope of the present invention.
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| CN111719403B (en) * | 2020-08-04 | 2021-11-19 | 中建钢构江苏有限公司 | Bridge connecting device |
| CN112127266B (en) * | 2020-09-21 | 2024-09-06 | 华南理工大学 | FRP tube-concrete-steel tube double tube composite structure node and construction method thereof |
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