CN114232637B - Connection structure of H-shaped steel connecting beam and H-shaped steel main support and construction method of horizontal support - Google Patents
Connection structure of H-shaped steel connecting beam and H-shaped steel main support and construction method of horizontal support Download PDFInfo
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- CN114232637B CN114232637B CN202111263115.6A CN202111263115A CN114232637B CN 114232637 B CN114232637 B CN 114232637B CN 202111263115 A CN202111263115 A CN 202111263115A CN 114232637 B CN114232637 B CN 114232637B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
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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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Abstract
The application discloses a connecting structure of an H-shaped steel connecting beam and an H-shaped steel main support, which is used for connecting a plurality of H-shaped steel main supports which are horizontally arranged and are parallel to each other into a whole, wherein a first web plate of the H-shaped steel main support and a second web plate of the H-shaped steel connecting beam extend along the vertical direction; a notch is arranged on the H-shaped steel connecting beam at least corresponding to one H-shaped steel main support, and the notch upwards penetrates through the upper flange of the H-shaped steel connecting beam and is away from the lower flange; the notch is clamped on the H-steel main support, a steel cover plate is detachably arranged on the upper flange of the H-steel connecting beam, the steel cover plate spans across the notch, the H-steel main support is tightly pressed in the notch, and the upper surface of the H-steel main support is coplanar with the upper surface of the H-steel connecting beam. The application also discloses a construction method of the horizontal support adopting the connecting structure. The notch on the H-shaped steel connecting beam is utilized to connect the H-shaped steel connecting beam with the H-shaped steel main support, so that the hole is prevented from being formed in the H-shaped steel main support, the integrity of the H-shaped steel connecting beam is ensured, and the protection level of a foundation pit can be improved.
Description
Technical Field
The application relates to a connecting structure of an H-shaped steel connecting beam and an H-shaped steel main support and a construction method of a horizontal support.
Background
In the process of excavation of a foundation pit, in order to ensure the safety of the foundation pit and avoid collapse, a horizontal support is often required to be erected in the foundation pit so as to provide horizontal supporting force for supporting piles or supporting walls, the horizontal support comprises main supports and connecting beams connected between the main supports, wherein the main supports provide supporting force for the supporting piles or the supporting walls, the connecting beams connect adjacent main supports, the stability of the main supports is improved, and a net structure is formed.
At present, the horizontal support of a steel structure is widely used, H steel is often used as a main support, relatively small-sized section steel is used as a connecting beam, and for convenient disassembly and installation, the main support and the connecting beam are generally connected by adopting a connecting plate and bolts, so that a large number of bolt holes are required to be formed in a flange or a web plate of the main support, the part of the main support is damaged, and the main support becomes a weak point, thereby being unfavorable for the safe construction of a foundation pit.
In order to improve the safety of the foundation pit excavation and the underground structure construction process, prestressing force is sometimes applied to the main support, the compressive resistance of the main support is improved, and the deformation of the foundation pit is reduced, but in the prior art, when the main support is connected by adopting the connecting beams, the connecting beams are connected to the main support by adopting bolts or welding, in the prestressing force application process of the main support, the corresponding connecting beams are driven to move due to certain change of the length of the main support, the length change generated by each main support in the prestressing force application process is not completely the same, and always has some difference, so that the connecting beams are synchronously acted in the prestressing force application process of the main support, and the connecting beams are bent to a certain extent due to different effects of the main supports on the connecting beams, so that the integral stability of the horizontal support is affected. In order to avoid the stability reduction of the horizontal support caused by the deformation of the connecting beam, in a part of foundation pit, the horizontal support only adopts the main support, the connecting beam is canceled, the problem can be solved, but the erection difficulty of the main support is increased, a certain number of upright posts are required to be erected for each main support, the number of upright posts is excessive, the difficulty of foundation pit excavation and underground structure construction is increased, and the construction efficiency can not be improved.
Disclosure of Invention
In order to solve the problems, the application firstly provides a connecting structure of an H-shaped steel connecting beam and an H-shaped steel main support, which is used for connecting a plurality of H-shaped steel main supports which are horizontally arranged and are parallel to each other into a whole, wherein a first web plate of the H-shaped steel main support and a second web plate of the H-shaped steel connecting beam extend along the vertical direction; a notch is arranged on the H-shaped steel connecting beam at least corresponding to one H-shaped steel main support, and the notch upwards penetrates through the upper flange of the H-shaped steel connecting beam and has a distance from the lower flange; the notch is clamped on the H-steel main support, a steel cover plate is detachably arranged on the upper flange of the H-steel connecting beam, the steel cover plate spans across the notch, the H-steel main support is tightly pressed in the notch, and the upper surface of the H-steel main support is coplanar with the upper surface of the H-steel connecting beam. Preferably, a notch is arranged on the H-shaped steel connecting beam corresponding to each H-shaped steel main support. Specifically, the H-shaped steel connecting beam is made of H-shaped steel of HM middle flange or HN narrow flange type. Specifically, the steel cover plate is connected to the upper flange of the H-shaped steel connecting beam by bolts.
According to the application, the H-shaped steel connecting beam is connected with the H-shaped steel main support in a way of forming a notch on the H-shaped steel connecting beam, no holes are formed in the H-shaped steel main support, no other parts are additionally added, the integrity of the H-shaped steel main support is ensured, the weak point caused by connection is not generated, the integral strength of the H-shaped steel main support is ensured, and larger prestress can be applied to the H-shaped steel main support, so that the protection grade of a foundation pit can be improved.
When the H-shaped steel connecting beam is constructed, firstly, the H-shaped steel connecting beam is erected, then, the H-shaped steel main support is erected, the H-shaped steel main support is movably clamped in the notch, and then, the H-shaped steel main support is prestressed, and as the H-shaped steel main support can freely move relative to the H-shaped steel connecting beam, the H-shaped steel connecting beam cannot be influenced in the prestressing process, so that the H-shaped steel connecting beam is kept in the original state, and after the prestressing is finished, a steel cover plate is installed, and the H-shaped steel connecting beam and the H-shaped steel main support are fixedly connected. Due to the adoption of the H-shaped steel connecting beam, the number of the stand columns can be reduced, the influence on excavation of a foundation pit and construction of an underground structure is reduced, and the construction efficiency can be effectively improved.
Further, in order to enlarge the contact area with the H steel main support, a backing plate is welded at the bottom of the notch, and the H steel main support is supported on the backing plate. The pad is utilized to enlarge the contact area between the H-shaped steel connecting beam and the H-shaped steel main support, so that the phenomenon that the local pressure is overlarge and the normal use of the H-shaped steel main support is influenced due to the fact that the web plate of the H-shaped steel connecting beam is directly supported on the web plate of the H-shaped steel connecting beam is avoided.
Further, in order to reinforce the notch, rib plates are welded on two sides of the notch along the length direction of the H-shaped steel connecting beam, are perpendicular to the length direction of the H-shaped steel connecting beam and extend along the vertical direction. The rib plates are utilized to supplement the strength loss caused by the notch so as to ensure the strength of the H-shaped steel connecting beam.
Further, in order to avoid the H-steel main stay from shaking in the notch, a gap is formed between the H-steel main stay and at least one side of the notch along the length direction of the H-steel connecting beam, and a steel plug plate is tightly inserted in the gap. The design can enable the H-steel main support to be completely fixed in the notch of the H-steel connecting beam, so that the H-steel connecting beam plays a limiting role on the H-steel main support.
The application further provides a construction method of the horizontal support, the horizontal support comprises a plurality of H-steel main supports which are horizontally arranged and parallel to each other and H-steel connecting beams for supporting the H-steel main supports, and the H-steel main supports and the H-steel connecting beams are connected together by adopting the connecting structure; the construction method comprises the following steps:
(1) Constructing an upright post at a set position, and installing an H-shaped steel connecting beam on the upright post;
(2) Installing an H-steel main support on the H-steel connecting beam, so that the H-steel main support is movably supported in the corresponding notch;
(3) Applying prestress to the H steel main support, and after the prestress is applied, fixedly mounting the H steel main support on the enclosing purlin;
(4) Tightly inserting a steel plug plate into a gap between the H-steel main support and the notch, connecting a steel cover plate to the H-steel connecting beam, and tightly pressing the H-steel main support in the notch;
(5) Finishing excavation of the foundation pit;
(6) And (3) removing the prestress of the H steel main support, removing the steel cover plate, pulling out the steel plug plate, removing the H steel main support, and then removing the connecting beam.
In the construction method, the H-steel main support is movably supported in the notch in the process of applying the prestress, so that the H-steel connecting beam cannot be influenced, the H-steel connecting beam is kept in the original state, and the problem that the connecting beam is bent and deformed due to the fact that the main support is fixedly connected with the connecting beam in the prior art is avoided. By using the construction method, the H-shaped steel connecting beam can only play a role in supporting the H-shaped steel, is not influenced by the prestressing force in the process of applying the prestressing force, and can improve the stability of the whole supporting system.
In the disassembly process, the prestress of the H steel main support is firstly removed, and the section of the H steel main support has trace expansion after the prestress is applied, so that the section of the H steel main support is basically restored to the original state after the prestress is removed, the section of the H steel main support is reduced, the gap between the H steel main support and the edge of the notch is enlarged, and the steel plug plate can be pulled out relatively easily. The H-shaped steel connecting beam is utilized to provide support for the H-shaped steel main support, so that the number of the stand columns can be effectively reduced, convenience is provided for excavation of a foundation pit and construction of an underground structure, and construction efficiency is provided.
In order to further reduce the damage to the H steel main support, end plates are welded at two ends of the H steel main support, and the H steel main support is detachably mounted on the enclosing purlin through the end plates. At present, the main support is generally connected to the enclosing purlin by adopting a connecting plate, the connecting plate is attached to the outer surfaces of the enclosing purlin and the main support, then the connecting plate is connected to the enclosing purlin and the main support by using bolts, a large number of bolt holes are formed in the main support by adopting the connecting method, the force transmission between the main support and the enclosing purlin is mainly carried out by using the bolts, the external force cannot be uniformly transmitted to the main support, so that the end part of the main support forms a large number of weak points, when an end plate is adopted, the end plate is supported on the end surface of the H steel main support, the external force can be uniformly transmitted to the H steel main support, and the internal stress uniformity of the H steel main support is ensured.
Drawings
Fig. 1 is a schematic view of a horizontal support formed using the present application.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is a view in the direction B-B in fig. 2.
FIG. 4 is a schematic view of a notch in an H-beam.
Fig. 5 is a perspective view in the direction C-C of fig. 3.
Fig. 6 is an end plate mounting structure of an H-steel main stay.
Fig. 7 is a view in the direction D-D in fig. 6.
Detailed Description
Referring to fig. 1-5, a connection structure of an H-section steel connecting beam 20 and an H-section steel main support 10 is used for connecting a plurality of H-section steel main supports 10 which are horizontally arranged and parallel to each other into a whole. Fig. 1 is a schematic view of a structure of a horizontal support formed by using the connection structure in the present embodiment.
The first web 11 of the H-steel main stay 10 and the second web 21 of the H-steel tie beam 20 both extend in the vertical direction. The H-steel main support 10 and the H-steel connecting beams 20 extend along the horizontal direction, the flanges of the H facing upwards are called upper flanges 22, the flanges of the H facing downwards are called lower flanges 23, a notch 24 is arranged on each H-steel connecting beam 20 corresponding to each H-steel main support 10, the notch 24 is rectangular, and the notch 24 upwards penetrates through the upper flanges 22 of the H-steel connecting beams and is spaced from the lower flanges 23; the notch is clamped on the H-steel main support 10, a steel cover plate 41 is detachably mounted on the upper flange 22 of the H-steel connecting beam by bolts 42, the steel cover plate 40 spans the notch 24, the H-steel main support 10 is tightly pressed in the notch, and the upper surface of the H-steel main support is coplanar with the upper surface of the H-steel connecting beam. A bolt hole 25 is formed in the upper flange 22 of the H-beam corresponding to each bolt 42.
In this embodiment, the H-steel main support 10 is made of an H-steel with a model of 400×400, the H-steel connecting beam 20 is made of a section steel with a model of 700×200, and the section steel with a model of 700×200 is an HN narrow flange type H-steel, it will be appreciated that, according to different needs, the H-steel connecting beam 20 may be made of another model of HN narrow flange type H-steel, or made of an HM middle flange type H-steel, for example, an H-steel with a model of 488×300, 600×200, 588×300, or 700×300 may be used to make the section steel connecting beam.
In order to enlarge the contact area with the H-steel main support 10, a backing plate 32 is welded to the bottom of the recess, and the H-steel main support 10 is supported on the backing plate 32.
In order to reinforce the notch, rib plates 31 are welded on both sides of the notch along the length direction of the H-shaped steel connecting beam 20, the rib plates 31 are perpendicular to the length direction of the H-shaped steel connecting beam 20 and extend in the vertical direction, the rib plates are welded on the second web plate 21, the upper flange 22 and the lower flange 23 of the H-shaped steel connecting beam 20, and the rib plates are welded with the backing plate 32.
In order to facilitate installation, in this embodiment, along the length direction of the H-shaped steel connecting beam 20, a gap is formed between the H-shaped steel main support 10 and two sides of the notch, and a steel plug plate 45 is tightly inserted into the gap, and the steel plug plate is made of flat steel. When in installation, firstly, an H steel main support is erected, then an H-shaped steel connecting beam is erected, the H steel main support is clamped in the notch, prestress is applied to the H steel main support, after the prestress is applied, a plug plate is inserted into a gap between the H steel main support and the H-shaped steel connecting beam, and finally, a steel cover plate 40 is covered on the notch and fastened by bolts, and the H steel main support is tightly clamped in the notch.
The construction method of the horizontal support of the above-mentioned connection structure is described below, and referring to fig. 1, the horizontal support includes a plurality of H-steel main supports 10 horizontally arranged and parallel to each other and H-steel connecting beams 20 for supporting the H-steel main supports, in this embodiment, six H-steel main supports 10 and four H-steel connecting beams 20 are exemplarily shown. It will be appreciated that in other embodiments, the number of H-steel main struts and H-steel tie-beams may be adjusted depending on the size and soil characteristics of the foundation pit.
The construction method comprises the following steps:
(1) Constructing an upright post at a set position, and installing an H-shaped steel connecting beam on the upright post;
(2) Installing an H-steel main support on the H-steel connecting beam, so that the H-steel main support is movably supported in the corresponding notch;
(3) Applying prestress to the H steel main support, and after the prestress is applied, fixedly mounting the H steel main support on the enclosing purlin;
(4) Tightly inserting a steel plug plate into a gap between the H-steel main support and the notch, connecting a steel cover plate to the H-steel connecting beam, and tightly pressing the H-steel main support in the notch;
(5) Finishing excavation of the foundation pit;
(6) And (3) removing the prestress of the H steel main support, removing the steel cover plate, pulling out the steel plug plate, removing the H steel main support and then removing the connecting beam.
Referring to fig. 6 and 7, both ends of the H-steel main stay 10 are welded with end plates 13, and the H-steel main stay 10 is detachably mounted to the surrounding purlin through the end plates 13. The upper and lower ends of the end plate 13 respectively exceed the upper flange a131 and the lower flange a132 of the H-steel main stay 10, the outer reinforcing plate 14 is welded to the portions of the end plate exceeding the upper flange a131 and the lower flange a132, the outer reinforcing plate 14 is simultaneously welded to the outer surfaces of the upper flange a131 and the lower flange a132, and the inner reinforcing plate 15 is welded between the end plate and the first web 11 of the H-steel main stay 10. The connection stability of the end plate and the H steel main support is improved by the outer reinforcing plate and the inner reinforcing plate, and meanwhile, the external force can be guaranteed to be uniformly transmitted to the H steel main support through the end plate.
Claims (5)
1. The construction method of the horizontal support is characterized in that the horizontal support comprises a plurality of H-steel main supports which are horizontally arranged and are parallel to each other and H-steel connecting beams for supporting the H-steel main supports, and a first web plate of the H-steel main supports and a second web plate of the H-steel connecting beams extend along the vertical direction; a notch is arranged on the H-shaped steel connecting beam at least corresponding to one H-shaped steel main support, and the notch upwards penetrates through the upper flange of the H-shaped steel connecting beam and has a distance from the lower flange; the notch is clamped on the H-steel main support, a steel cover plate is detachably arranged on the upper flange of the H-steel connecting beam, the steel cover plate spans across the notch, the H-steel main support is tightly pressed in the notch, and the upper surface of the H-steel main support is coplanar with the upper surface of the H-steel connecting beam; a gap is formed between the H-steel main support and at least one side of the notch along the length direction of the H-steel connecting beam, and a steel plug plate is tightly inserted in the gap;
the construction method comprises the following steps:
(1) Constructing an upright post at a set position, and installing an H-shaped steel connecting beam on the upright post;
(2) Installing an H-steel main support on the H-steel connecting beam, so that the H-steel main support is movably supported in the corresponding notch;
(3) Applying prestress to the H steel main support, and after the prestress is applied, fixedly mounting the H steel main support on the enclosing purlin;
(4) Tightly inserting a steel plug plate into a gap between the H-steel main support and the notch, connecting a steel cover plate to the H-steel connecting beam, and tightly pressing the H-steel main support in the notch;
(5) Finishing excavation of the foundation pit;
(6) Removing the prestress of the H steel main support, removing the steel cover plate, pulling out the steel plug plate, removing the H steel main support, and then removing the connecting beam;
the two ends of the H steel main support are welded with end plates, the end plates are perpendicular to the length direction of the H steel main support, and the H steel main support is detachably mounted on the enclosing purlin through the end plates.
2. The construction method according to claim 1, wherein a backing plate is welded to the bottom of the notch, and the H-steel main stay is supported on the backing plate.
3. The construction method according to claim 1, wherein rib plates are welded on both sides of the notch along the length direction of the H-beam, the rib plates being perpendicular to the length direction of the H-beam and extending in the vertical direction.
4. The construction method according to claim 1, wherein the steel deck is bolted to the upper flanges of the H-section steel tie beams.
5. The construction method according to claim 1, wherein the H-beam is made of HM middle flange or HN narrow flange type H-beam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111263115.6A CN114232637B (en) | 2021-10-26 | 2021-10-26 | Connection structure of H-shaped steel connecting beam and H-shaped steel main support and construction method of horizontal support |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111263115.6A CN114232637B (en) | 2021-10-26 | 2021-10-26 | Connection structure of H-shaped steel connecting beam and H-shaped steel main support and construction method of horizontal support |
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| CN114232637A CN114232637A (en) | 2022-03-25 |
| CN114232637B true CN114232637B (en) | 2023-10-03 |
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| JPH10152840A (en) * | 1996-11-21 | 1998-06-09 | Nishimatsu Constr Co Ltd | Constructing method for earth retaining timbering |
| CN206625235U (en) * | 2017-03-09 | 2017-11-10 | 中国建筑第八工程局有限公司 | The sliding support that bracing members are connected with lattice column |
| CN207891890U (en) * | 2018-01-11 | 2018-09-21 | 中铁第四勘察设计院集团有限公司 | A kind of groove device for fixing bracing members |
| CN110485429A (en) * | 2019-03-21 | 2019-11-22 | 安徽省第一建筑工程有限公司 | A kind of prestressing force fashioned iron assembled combination inner support construction method |
| CN111456035A (en) * | 2020-05-25 | 2020-07-28 | 天津大学 | Assembly type truss type foundation pit horizontal steel supporting structure and application thereof |
| CN213897145U (en) * | 2020-10-23 | 2021-08-06 | 山东科技大学 | Fixing device for steel support and section steel beam |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109183807B (en) * | 2018-09-17 | 2024-01-26 | 江苏东合南岩土科技股份有限公司 | Movable steel support and construction method thereof |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10152840A (en) * | 1996-11-21 | 1998-06-09 | Nishimatsu Constr Co Ltd | Constructing method for earth retaining timbering |
| CN206625235U (en) * | 2017-03-09 | 2017-11-10 | 中国建筑第八工程局有限公司 | The sliding support that bracing members are connected with lattice column |
| CN207891890U (en) * | 2018-01-11 | 2018-09-21 | 中铁第四勘察设计院集团有限公司 | A kind of groove device for fixing bracing members |
| CN110485429A (en) * | 2019-03-21 | 2019-11-22 | 安徽省第一建筑工程有限公司 | A kind of prestressing force fashioned iron assembled combination inner support construction method |
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