Method for positioning and connecting steel blade corner and precast concrete caisson segment

Abstract

The application discloses a positioning and connecting method for steel angle and precast concrete caisson segment, which comprises the following steps: erecting the steel angle on temporary supporting cushions and temporarily supporting; pouring concrete into the cavities of the steel angles; after curing, removing the temporary supports; hoisting the precast segment above the steel angle, and aligning and installing the positioning holes at the bottom of the precast segment with the positioning pin shafts on the top plate of the steel angle; pouring waterproof mortar at the joint between the bottom of the precast segment and the top plate of the steel angle; installing longitudinal bolts between the precast segment and the steel angle and applying pre-tightening force; the bottom of the precast segment is embedded with two lengthwise steel plates respectively, and the two lengthwise steel plates are welded to the steel angle through shear keys and stiff plates. The application has the advantages that the steel angle replaces the concrete angle, the strength of the steel structure is greatly improved compared with the concrete, and the steel angle can bear the combined action of axial force and internal and external bending moment during construction; the positioning pin shafts arranged on the top of the steel angle solve the positioning problem of the precast segment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of open caisson construction, and particularly relates to a positioning and connecting method for steel blade corners and prefabricated concrete open caisson segments. BACKGROUND

[0002] In the process of open caisson construction, the blade corners bear axial force, inner and outer bending moments, and the stress is complex and concentrated.

[0003] The current open caisson is divided into two types of ordinary cast-in-situ open caisson and prefabricated open caisson, the ordinary cast-in-situ open caisson has the defect of long cast-in-situ construction period, and the prefabricated open caisson has the problem of high requirement for the assembly precision control of the prefabricated open caisson segments.

[0004] Based on the above problems, the combination of steel blade corners and prefabricated concrete open caisson segments to form a steel-concrete combined open caisson is an effective solution to solve the above problems, but there is no mature and effective construction method for how to position and connect the steel blade corners and the prefabricated concrete open caisson segments, and therefore the positioning and connecting method is urgently needed by the skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a positioning and connecting method for steel blade corners and prefabricated concrete open caisson segments according to the deficiencies of the prior art, which positions by setting positioning pins between the steel blade corners and the prefabricated segments, and effectively connects the prefabricated segments and the steel blade corners by embedding through steel plates on both sides of the prefabricated segments and respectively welding shear keys and stiffeners between the through steel plates and the steel blade corners.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] A positioning and connecting method for steel blade corners and prefabricated concrete open caisson segments, characterized in that the positioning and connecting method comprises the following steps:

[0008] S1: installing temporary support pads on the construction ground, erecting the bottom of the steel blade corner on the temporary support pads, and respectively setting temporary supports on both sides of the steel blade corner for support and fixation; wherein a positioning pin hole is formed in the top plate of the steel blade corner;

[0009] S2: sequentially installing each steel blade corner to form a complete ring of steel blade corners; installing a positioning pin in the positioning pin hole; pouring concrete into the cavity of each steel blade corner and curing; after curing, removing each temporary support;

[0010] S3: hoist the prefabricated pipe piece above the steel sharp corner, and align and install the positioning hole at the bottom of the prefabricated pipe piece with the positioning pin shaft on the top plate of the steel sharp corner; pour waterproof mortar at the joint between the bottom of the prefabricated pipe piece and the top plate of the steel sharp corner;

[0011] S4: install longitudinal bolts between the prefabricated pipe piece and the steel sharp corner and apply pre-tightening force to fasten the two;

[0012] S5: the bottom of the prefabricated pipe piece is respectively pre-buried with an inner longitudinal steel plate and an outer longitudinal steel plate, a shear key is welded between the inner longitudinal steel plate and the inner side of the steel sharp corner for connection and fixation, and a stiffened plate is welded between the outer longitudinal steel plate and the top plate of the steel sharp corner for reinforcement.

[0013] The temporary support comprises diagonal braces separately arranged on the two sides of the steel sharp corner, one end of the diagonal brace is fixed to the side wall of the steel sharp corner, and the other end is supported on the construction ground.

[0014] The lower part of the positioning pin shaft extends into the cavity of the steel sharp corner and is integrated with the concrete, and the upper part of the positioning pin shaft is conical and protrudes above the top plate of the steel sharp corner.

[0015] Before hoisting the prefabricated pipe piece, an elastic sealing ring is pre-installed on the top plate of the steel sharp corner, the elastic sealing ring is clamped between the bottom of the prefabricated pipe piece and the top plate of the steel sharp corner, and the waterproof mortar is poured outside the elastic sealing ring.

[0016] In step S4, a longitudinal bolt hole is pre-formed in the prefabricated pipe piece, the longitudinal bolt is threaded in the longitudinal bolt hole and fastened to connect and apply pre-tightening force to the prefabricated pipe piece and the steel sharp corner.

[0017] A second prefabricated pipe piece is continuously installed above the first prefabricated pipe piece, a second longitudinal bolt is threaded in the vertical bolt hole of the second prefabricated pipe piece, the lower end of the second longitudinal bolt is fastened and connected with the upper end of the longitudinal bolt in the first prefabricated pipe piece, and the nut at the upper end of the second longitudinal bolt is tightened to apply pre-tightening force to the second prefabricated pipe piece.

[0018] The advantages of the present application are:

[0019] (1) The steel sharp corner replaces the concrete sharp corner, and the strength of the steel structure is greatly improved compared with the concrete, which can withstand the combined action of axial force and internal and external bending moment in construction;

[0020] (2) The prefabricated caisson pipe piece has high construction efficiency and small risk;

[0021] (3) The steel sharp corner is filled with concrete, which improves the overall stiffness of the sharp corner;

[0022] (4) Steel blade angle top sets positioning pin shaft, solves the positioning problem of prefabricated pipe piece;

[0023] (5) The prefabricated pipe piece is provided with a through-embedded steel plate connected with the steel blade angle;

[0024] (6) The steel blade angle is slightly larger than the prefabricated pipe piece, which is beneficial to reduce the pipe wall side friction resistance, facilitate sinking, and leave out the outside stiff plate installation space;

[0025] (7) The prefabricated pipe piece and the steel blade foot are pre-tightened through longitudinal bolts, compressing the elastic sealing ring and enhancing the water stop effect at the connection. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the present application that the steel blade angle is erected on the temporary support pad and temporarily supported;

[0027] Figure 2 It is a schematic diagram of the present application that the concrete is poured in the steel blade angle cavity and the temporary support is removed;

[0028] Figure 3 It is a schematic diagram of the present application that the first prefabricated pipe piece is hoisted on the steel blade angle;

[0029] Figure 4 It is a schematic diagram of the present application Figure 3 The enlarged schematic detail view of part A;

[0030] Figure 5 It is a schematic diagram of the present application that the longitudinal bolt is installed between the first prefabricated pipe piece and the steel blade angle;

[0031] Figure 6 It is a schematic diagram of the present application that the first prefabricated pipe piece is welded with the steel blade angle;

[0032] Figure 7 It is a schematic diagram of the present application Figure 6 The enlarged schematic detail view of part B;

[0033] Figure 8 It is a schematic diagram of the present application that the second prefabricated pipe piece is installed. EMBODIMENT

[0034] The features and other related features of the present application are further described in detail below by examples combined with the drawings, so as to facilitate the understanding of the same by the skilled in the art:

[0035] As Figures 1-8, the various marks in the figure are respectively: steel blade angle 1, temporary support pad 2, temporary support 3, concrete 4, positioning pin shaft hole 5, positioning pin shaft 6, prefabricated pipe piece 7, outer side long steel plate 8, inner side long steel plate 9, elastic sealing ring 10, waterproof mortar 11, longitudinal bolt 12, stiff plate 13, shear key 14, fillet weld 15, second section prefabricated caisson 16, longitudinal bolt 17.

[0036] Embodiment: as shown in Figures 1-8 , the embodiment specifically relates to a positioning and connecting method of steel blade angle and prefabricated concrete caisson pipe piece, which comprises the following steps:

[0037] (S1) as shown in Figure 1 , temporary support pad 2 is laid on the construction ground, the bottom support of steel blade angle 1 is arranged on the temporary support pad 2, and temporary supports 3 are arranged on both sides of the steel blade angle 1 for support and fixation, the temporary supports 3 adopt inclined support form, the upper end is connected to the side wall surface of the steel blade angle 1, and the lower end is supported on the construction ground. The steel blade angles 1 are sequentially assembled and welded, so as to form a circular or rectangular steel blade angle structure.

[0038] Among them, the top plate of the steel blade angle 1 is provided with a positioning pin shaft hole 5, which is used for subsequent installation of a positioning pin shaft 6.

[0039] (S2) as shown in Figure 2 , the concrete 4 is poured into the cavity of the steel blade angle 1, which can greatly improve the overall strength of the steel blade angle 1, and the positioning pin shaft 6 is installed in the positioning pin shaft hole 5, the upper end of the positioning pin shaft 6 is in conical structure; after the concrete 4 in the steel blade angle 1 is cured, the temporary supports 3 are removed.

[0040] (S3) as shown in Figure 3 , 4 , the prefabricated pipe piece 7 is hoisted and moved to the top of the steel blade angle 1, the elastic sealing rings 10 are pre-installed on both sides of the top plate of the steel blade angle 1 according to the to-be-installed area of the prefabricated pipe piece 7, the prefabricated pipe piece 7 is slowly lowered and erected on the top plate of the steel blade angle 1, the bottom of the prefabricated pipe piece 7 is provided with a guide hole and contacts the positioning pin shaft 6 during the lowering process and is accurately positioned under the guidance of the positioning pin shaft 6, so as to realize accurate positioning and installation of the prefabricated pipe piece 7; the elastic sealing ring 10 tightly fits and seals the gap between the two under the pressure of the prefabricated pipe piece 7; then waterproof mortar 11 is further poured between the gap between the bottom surface of the prefabricated pipe piece 7 and the top surface of the steel blade angle 1 for sealing. It should be noted that the outer side long steel plate 8 and the inner side long steel plate 9 are arranged on both sides of the bottom of the prefabricated pipe piece 7.

[0041] (S4) as shown in Figure 5As shown, the prefabricated pipe piece 7 is provided with a vertical bolt hole, a longitudinal bolt 12 is inserted into the prefabricated pipe piece 7 through the vertical bolt hole, the lower end of the longitudinal bolt 12 is threadedly connected with the top plate of the steel cutting corner 1, and the nut is tightened to apply a pre-tightening force to the prefabricated pipe piece 7, compress the elastic sealing ring, and enhance the water sealing effect at the connection.

[0042] (S5) As shown in Figure 6 , the width of the steel cutting corner 1 is slightly larger than the width of the prefabricated pipe piece 7, which is beneficial to reducing the pipe wall side friction resistance during sinking, facilitating sinking, and leaving space for installing the stiffener plate 13. The inner side of the prefabricated pipe piece 7 is flush with the inner side of the steel cutting corner 1, a shear key 14 is arranged between the inner side of the prefabricated pipe piece 7 and the inner side of the steel cutting corner 1 and is welded, as shown in Figure 7 , the lower side of the shear key 14 is provided with a single-sided cutout and is welded to the inner side of the steel cutting corner 1 by an angle weld 15. The stiffener plate 13 is arranged between the outer side of the prefabricated pipe piece 7 and the top plate of the steel cutting corner 1 and is welded, and the welding of the stiffener plate 13 and the shear key 14 can further improve the connection performance between the prefabricated pipe piece 7 and the steel cutting corner 1.

[0043] (S6) As shown in Figure 8 , the second prefabricated pipe piece 16 is continuously installed above the first prefabricated pipe piece 7, the second longitudinal bolt 17 is arranged in the vertical bolt hole of the second prefabricated pipe piece 16, the lower end of the second longitudinal bolt 17 is tightly connected with the upper end of the longitudinal bolt 12 in the first prefabricated pipe piece 7, and the nut at the upper end of the second longitudinal bolt 17 is tightened to apply a pre-tightening force to the second prefabricated pipe piece.

[0044] The beneficial effects of the embodiment are:

[0045] (1) The steel cutting corner replaces the concrete cutting corner, and the strength of the steel structure is greatly improved compared with the concrete, which can withstand the combined action of the axial force and the internal and external bending moment during construction;

[0046] (2) The prefabricated caisson pipe piece has high construction efficiency and low risk;

[0047] (3) The steel cutting corner is filled with concrete, which improves the overall stiffness of the cutting corner;

[0048] (4) The positioning pin shaft is arranged on the top of the steel cutting corner, which solves the positioning problem of the prefabricated pipe piece;

[0049] (5) The prefabricated pipe piece is provided with a through-embedded steel plate, which is connected with the steel cutting corner;

[0050] (6) The size of the steel cutting corner is slightly larger than that of the prefabricated pipe piece, which is beneficial to reducing the pipe wall side friction resistance, facilitating sinking, and leaving space for installing the outer stiffener plate;

[0051] (7) The prefabricated segment and the steel blade foot are pre-tightened by longitudinal bolts, compressing the elastic sealing ring and enhancing the water stop effect at the connection.

Claims

1. A method of positioning and connecting a steel blade corner to a precast concrete caisson segment, characterized in that The positioning and connecting method comprises the following steps: S1: installing temporary supports on the construction ground, erecting the bottom of the steel angle on the temporary supports, and setting temporary supports on both sides of the steel angle for support and fixation; wherein a positioning pin shaft hole is formed on the top plate of the steel angle; the temporary supports comprise diagonal braces separately arranged on both sides of the steel angle, one end of the diagonal brace is fixed on the side wall of the steel angle, and the other end is supported on the construction ground; S2: sequentially installing each steel angle to form a whole ring of steel angles; installing a positioning pin shaft in the positioning pin shaft hole; pouring concrete into the cavity of each steel angle and curing; after curing, removing each temporary support; the lower part of the positioning pin shaft extends into the cavity of the steel angle and is integrated with the concrete, and the upper part of the positioning pin shaft is tapered and protrudes above the top plate of the steel angle; S3: hoisting a prefabricated segment above the steel angle, and aligning and installing the positioning hole at the bottom of the prefabricated segment with the positioning pin shaft on the top plate of the steel angle; pouring waterproof mortar at the joint between the bottom of the prefabricated segment and the top plate of the steel angle; S4: installing longitudinal bolts between the prefabricated segment and the steel angle and applying a pre-tightening force to fasten the two; S5: the bottom of the prefabricated segment is pre-buried with an inner longitudinal steel plate and an outer longitudinal steel plate, a shear key is welded between the inner longitudinal steel plate and the inner side of the steel angle for connection and fixation, and a stiffener is welded between the outer longitudinal steel plate and the top plate of the steel angle for reinforcement.

2. The method for positioning and connecting a steel blade corner with a precast concrete caisson segment according to claim 1, characterized in that Before hoisting the prefabricated segment, an elastic sealing ring is pre-installed on the top plate of the steel angle, the elastic sealing ring is clamped between the bottom of the prefabricated segment and the top plate of the steel angle, and the waterproof mortar is poured outside the elastic sealing ring.

3. The method for positioning and connecting a steel blade corner with a precast concrete caisson segment according to claim 1, characterized in that In step S4, a vertical bolt hole is pre-formed in the prefabricated segment, the longitudinal bolt is threaded through the vertical bolt hole and fastened to connect the prefabricated segment and the steel angle and apply a pre-tightening force.

4. The method for positioning and connecting a steel blade corner with a precast concrete caisson segment according to claim 3, characterized in that A second prefabricated segment is installed above the first prefabricated segment, a second longitudinal bolt is threaded through the vertical bolt hole of the second prefabricated segment, the lower end of the second longitudinal bolt is fastened to the upper end of the longitudinal bolt in the first prefabricated segment, and the nut on the upper end of the second longitudinal bolt is tightened to apply a pre-tightening force to the second prefabricated segment.

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