CN216948300U - Node structure for combining temporary beam and structural beam at position of reverse construction opening - Google Patents

Abstract

The utility model belongs to a node structure for combining a temporary beam and a structural beam at a position of a reverse construction structural opening in reverse construction method deep foundation pit engineering. The technical scheme is as follows: the inside of the column span is provided with a hole under the normal use condition; under the condition of reverse construction, combining the temporary beam in the opening with the structural beam outside the opening to form a reverse construction structural beam with a column span and a through length; the main reinforcement configuration of the reverse structure beam meets the enveloping reinforcement configuration requirements of two stages of reverse operation and normal use, and the main reinforcement of the structure beam comprises a first structure beam main reinforcement in the normal use stage and a second structure beam main reinforcement for reverse operation reinforcement; anchoring the first structural beam main rib into the side wall of the opening according to the support condition in the normal use stage, and welding and lengthening the first structural beam main rib and the temporary beam main rib; and combining the main reinforcement of the second structural beam with the main reinforcement of the rest temporary beam which is not welded and lengthened in the temporary beam. The node structure simultaneously meets the reinforcement and anchoring requirements of a reverse operation stage and a normal use stage.

Description

Node structure for combining temporary beam and structural beam at position of reverse construction opening

Technical Field

The utility model belongs to the deep foundation pit engineering of a reverse construction method, and particularly relates to a structure combining a temporary beam and a structural beam.

Background

The reverse construction method deep foundation pit engineering is different from the conventional forward construction method, underground layers of reverse construction structural beam plates and one column and one pile are directly used as horizontal supports and vertical supports in the foundation pit implementation stage, the vertical structural wall and the secondary structure in the basement are limited by the reverse construction method process, the reverse construction stage cannot be formed at one time, and a complete structural stress system matched with the normal use stage can be formed by supplementing and aligning layer by layer from bottom to top after the reverse construction excavation to the base and the foundation slab construction are completed. Therefore, in the reverse working stage, the problems that cantilever occurs to a beam slab system taking the side wall as a support and the original stress mode of the structural system is changed due to the fact that the side wall at the periphery of the opening cannot be formed at one time at the position of the structural opening such as a ramp, a stair, an air shaft or a hoisting hole can often occur. The design of the main structure system and the anchor conditions are usually considered according to the normal use stage and do not cover the working condition of the inverse working stage, so that the design is inconsistent with the actual engineering.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a node structure for combining a temporary beam and a structural beam at the position of a reverse structure opening, which simultaneously meets the reinforcement and anchoring requirements of a reverse construction stage and a normal use stage.

The technical scheme of the utility model is as follows: a node structure for combining a temporary beam and a structural beam at a reverse structure opening position is characterized in that an opening is formed in a column span under a normal use condition; under the condition of reverse construction, combining the temporary beam in the opening with the structural beam outside the opening to form a reverse construction structural beam with a column span and a through length; the intersection position of the temporary beam and the structural beam is the position of the hole side wall in a normal use state, the main rib configuration of the reverse-acting structural beam meets the requirement of enveloping reinforcement in two stages of reverse action and normal use, and the main ribs of the reverse-acting structural beam comprise the temporary beam main ribs of the temporary beam and the structural beam main ribs of the structural beam; the structural beam main reinforcement comprises a first structural beam main reinforcement in a normal use stage and a second structural beam main reinforcement for reverse reinforcement; anchoring the first structural beam main rib into the side wall of the opening according to the support condition in the normal use stage, and welding and lengthening the first structural beam main rib and the temporary beam main rib; the main reinforcement of the second structure beam is combined with the main reinforcement of the rest temporary beam which is not welded and lengthened in the temporary beam to replace the full-length reinforcement.

Based on the technical characteristics: the width of the reverse structural beam is greater than the beam width calculated under normal use conditions.

Based on the technical characteristics: and the main reinforcement at the corner of the beam width widened part is anchored into the side wall of the hole, and is welded and lengthened with the main reinforcement of the temporary beam.

The technology is mainly used for solving the problem of node construction of the combination of the temporary beam and the structural beam at the position of the hole of the reverse construction structure. On one hand, the cross section and the reinforcing bars of the structural beam are reinforced under the normal use condition, and extend and span the range of the opening, so that a full-length reverse-acting structural beam in the span range of the whole column is formed, and the problem of cantilever of a structural member around the opening in the reverse-acting stage is solved; on the other hand, a structural measure of welding and lengthening main ribs is adopted, envelope design is carried out on the combined beam according to two-stage working conditions, and the retained original structural beam can still meet the reinforcement and anchoring requirements in the normal use stage after the reverse temporary beam in the range of the opening is chiseled.

Drawings

FIG. 1 is a schematic plan view of the structure under normal use conditions of the opening position.

FIG. 2 is a schematic plan view of a reverse structure of the opening position.

Fig. 3 is a plane node structure in which a temporary beam and a structural beam are combined at the position of an opening of a reverse structure when the reverse structure beam is not widened.

Fig. 4 is a plane node structure in which a temporary beam and a structural beam are combined at the position of a hole of a reverse structure when the reverse structure beam is widened.

FIG. 5 is an elevation view of a node structure formed by combining a temporary beam and a structural beam at the position of a reverse construction structural opening; fig. 3 and a-a sectional view of fig. 4.

Reference numerals

1-opening side wall; 2-a structural beam; 3-temporary beams; 4-structural beam main reinforcement; 5-welding a joint; 6-temporary beam main reinforcement; 7-outer frame columns of the hole; 8-reversely making a structural beam; 9-corner main reinforcement; 10-beam widened portion; 11-full length steel bar.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1, in the original structural system, the structural beam 2 outside the opening takes the opening sidewall 1 as a support condition, and is not through within the opening. The original structure system herein refers to the structure state before reverse reinforcement design, that is, the structure state designed under the normal use condition of the main structure. Because the reverse construction method structure needs to consider the stress requirements of the foundation pit in the reverse construction stage and the normal use stage after the foundation pit is finished at the same time, and needs to strengthen the structural member on the basis of the normal use structural system, the original structural system is in the normal structural design state before the reverse construction strengthening is carried out.

As shown in fig. 2, in the reverse construction stage, because the opening side wall 1 adopts a vertical reservation measure and cannot form an effective support function, in order to solve the problem of vertical support of the structure, the structural beam 2 outside the opening extends towards the opening direction until the opening outer frame column 7, so that a reverse construction structural beam 8 formed by combining the structural beam 2 outside the opening in the column span range and the temporary beam 3 in the opening is formed, and the support conversion of the reverse construction structural system is realized.

The cross section and the reinforcing bars of the combined reverse structure beam 8 are rechecked and reinforced, and the reinforcing bars are designed according to two-stage enveloping reinforcing bars of the reverse operation and normal use stages. The reverse construction method utilizes the main structure beam plate to be used as a horizontal supporting component in the foundation pit implementation stage, so that the structural beam plate system in the reverse construction method meets the normal stress requirement of the structure in the normal use stage, and also meets the stress requirement of the structural beam plate as the horizontal supporting system in the foundation pit reverse construction implementation stage, and therefore, the beam plate system is designed according to the stress conditions of different working conditions in two stages. The envelope design refers to that the sectional dimension, the bearing capacity and the reinforcing bars of the structural member are valued according to large values which simultaneously meet the requirements of two stages, namely a reverse operation stage and a normal use stage. When the section of the original structural member needs to be widened, heightened or reinforced during reverse operation design, on the premise that the reinforcing bars in the section range of the original structural member are not lower than the design requirement of the original structure, the main reinforcing bars and the stirrups are additionally arranged in the widening and heightening range to form a double reinforcing bar system, so that the stress reinforcing bar requirement in the reverse operation stage is met, and the enveloping reinforcing bar design under the condition of two stages is realized.

As shown in fig. 3 and 5, the main reinforcements of the reverse structural beam 8 include the temporary beam main reinforcement 6 of the temporary beam 3 and the structural beam main reinforcement 4 of the structural beam 2. The main reinforcement 4 of the structural beam and the main reinforcement 6 of the temporary beam are actually main reinforcements of the reverse construction structural beam 8 in different sections; the gauge and number of cage bars in both sections are generally uniform. According to the reverse construction strengthening design requirement, a specification of the steel bars is unified, if the specification of the steel bars calculated by the main steel bars 4 of the structural beam in the normal use stage is different from that calculated in the reverse construction stage, the main steel bars and the quantity of the main steel bars can be replaced by the main steel bars with the same specification type as that of the reverse construction structural beam 8 according to the equal strength of the sections of the steel bars during the design in the reverse construction stage.

The structural beam main tendons 4 include a first structural beam main tendon for a normal use stage and a second structural beam main tendon for reverse reinforcement. When the structural beam 2 outside the opening is not required to be widened, the structural beam main ribs 4 required by the original structural design of the section range of the structural beam 2, namely, the first structural beam main ribs are anchored into the opening side wall 1 according to the support conditions in the normal use stage, the temporary beam main ribs 6 and the structural beam main ribs 4 are lengthened by adopting welding measures, and the welding joints 5 shown in the figure 3 are arranged in a staggered mode according to the construction requirements. The welding lengthening means that the temporary beam main rib 6 of the temporary beam in the hole range is welded and connected with the structural beam main rib 4 outside the hole. The main reinforcement of the first structural beam outside the opening needs to be anchored into the side wall of the opening according to the structural design requirements in the normal use stage, and the main reinforcement cannot penetrate through the range of the opening to cover the opening, so the main reinforcement needs to be welded and lengthened for utilization, and the main reinforcement in the reverse working stage can penetrate through the requirement and the anchoring requirement of the external structural beam in the later stage after the temporary beam in the opening is removed can be met.

As shown in fig. 4 and 5, when the structural beam 2 outside the opening needs to be widened, that is, the width of the reverse structural beam 8 is greater than the structural width of the structural beam 2 under normal use conditions, the first structural beam main rib and the corner main rib 9 of the widened beam portion, which are required by the original structural design of the cross-section range of the structural beam 2, are anchored into the opening sidewall 1 according to the support conditions in the normal use stage. Since the beam widening 10 will be retained during normal use, the corner studs 9 should be anchored into the opening side wall 1 in the normal use condition of the support in view of the beam-to-wall structural connection. And the temporary beam main rib 6 in the hole and the corner main rib 9 of the widened part are lengthened by adopting a welding measure.

The structural beam main tendons 4 include first structural beam main tendons and second structural beam main tendons for reverse reinforcement at the normal use stage. And the rest main reinforcements which are not welded and lengthened in the second structural beam main reinforcement and the temporary beam main reinforcement 6 are combined and replaced by the full-length reinforcing steel bars 11. The through-length reinforcement 11 is shown in phantom in fig. 3 and 4 to distinguish it from the welded-in main reinforcement. That is, the second structural beam main reinforcement, which is arranged by reverse reinforcement except the welding lengthening measure, can be pulled through in the reverse structural beam 8 in the whole length.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (3)

1. A node structure for combining a temporary beam and a structural beam at a reverse structure opening position is characterized in that an opening is formed in a column span under a normal use condition; the method is characterized in that: under the condition of reverse construction, combining the temporary beam (3) in the opening with the structural beam (2) outside the opening to form a reverse construction structural beam (8) with a column span and a through length; the intersection of the temporary beam (3) and the structural beam (2) is the position of the opening side wall (1) in a normal use state, the main rib configuration of the reverse-acting structural beam (8) meets the enveloping reinforcement configuration requirements of two stages of reverse action and normal use, and the main ribs of the reverse-acting structural beam (8) comprise the temporary beam main rib (6) of the temporary beam (3) and the structural beam main rib (4) of the structural beam (2); the structural beam main reinforcement (4) comprises a first structural beam main reinforcement in a normal use stage and a second structural beam main reinforcement for reverse reinforcement; the first structural beam main rib is anchored into the opening side wall (1) according to the support condition in the normal use stage, and is welded and lengthened with the temporary beam main rib (6); the second structure beam main reinforcement and the rest which is not welded and lengthened in the temporary beam (3) are combined to replace a full-length reinforcing steel bar (11).

2. The node construction for combining the temporary beam with the structural beam at the position of the reverse construction hole as claimed in claim 1, wherein: the width of the reverse construction beam (8) is greater than the beam width calculated under normal use conditions.

3. The node construction for combining the temporary beam with the structural beam at the position of the reverse construction hole as claimed in claim 2, wherein: and the main corner ribs (9) of the beam width widened parts (10) are embedded into the hole side wall (1) and are welded and lengthened with the temporary beam main ribs (6).

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