CN103911990A - A kind of underwater pouring pipe column with retaining wall and its construction method - Google Patents

Abstract

The invention discloses an underwater pouring type pipe column with a retaining wall and a construction method thereof, which are characterized in that in the process of forming a hole, the retaining wall is poured by an underwater quick setting material along the inner wall of the hole from bottom to top to form a retaining wall hole, and a cylindrical reinforcement cage is put down into the retaining wall hole; placing steel structure conical bottom section templates in a cylinder of the reinforcement cage, assembling the steel structure conical bottom section templates section by section from bottom to top, and placing prefabricated inner templates of all sections to form an inner mold; pouring bottom sealing concrete in the wall protecting hole to form a concrete bottom plate, so that the wall protecting hole is formed into a bottom sealing annular cylinder; and pouring pipe body concrete between the outer mold and the inner mold by taking the wall protection layer as the outer mold in the bottom-sealed annular cylinder, and taking out the prefabricated inner templates of all the sections from top to bottom after the pipe body concrete meets the strength requirement to complete the construction of the underwater pouring type pipe column with the wall protection. The invention can be effectively applied to civil engineering, bridge building and hydraulic structures, and improves the construction efficiency.

Description

A kind of underwater pouring pipe column with retaining wall and its construction method

technical field

The invention relates to a foundation cast-in-place construction method in civil engineering, bridge house construction and hydraulic structures.

Background technique

The existing caisson and immersed tube foundation construction adopts the method of segmental prefabricated components, then relying on self-weight or auxiliary measures to connect heights and subsidence, and then carry out grouting treatment. For this process, in addition to the difficulties in transporting prefabricated parts at the construction site, the large hoisting equipment, and the difficulty in sinking the prefabricated parts, there are also the following points that are difficult to control: after sinking, the whole body is easy to tilt due to the residue at the bottom; The splicing construction at joint joints is difficult; the grouting process is complicated, the quality of grouting is difficult to control, and the construction period is long and the cost is high. The above problems of prefabrication construction have become recognized problems in the industry.

Contents of the invention

In order to avoid the disadvantages of the above-mentioned prior art, the present invention provides an underwater pouring pipe column with retaining wall and its construction method, so as to facilitate construction and improve construction efficiency.

The present invention adopts following technical scheme for solving technical problems:

The structural feature of the underwater pouring pipe column with retaining wall of the present invention is: the pipe column is formed by pouring underwater quick-setting material between the cast-in-place reinforced concrete pipe column and the inner wall of the hole to form a retaining wall layer, and the said pipe column The column is backed with concrete as a cast-in-place concrete slab.

The characteristics of the construction method of the underwater pouring type pipe column with retaining wall of the present invention are to carry out according to the following steps:

a. At the position where the pipe string is set, use a drilling rig to construct a hole;

b. Utilize an annular sliding form device in the forming hole to pour the retaining wall layer with underwater quick-setting material from bottom to top along the inner wall of the forming hole to form a retaining wall hole, and lower a cylindrical reinforcement cage into the retaining wall hole;

c. Lower the bottom section formwork in the tube of the steel cage, assemble it section by section from bottom to top on the bottom section formwork, and lower the prefabricated inner formwork of each section through the external counterweight to form an inner mold. After locking the inner mold, Bottom plate concrete is poured in the retaining wall hole to form a concrete bottom cover, and the bottom section formwork is poured in the concrete bottom cover of the pipe column hole for positioning, so that the retaining wall hole forms a bottom-sealed annular cylinder;

d. In the annular cylinder with the bottom cover, use the retaining layer as the outer mold, and pour concrete for the pipe body between the outer mold and the inner mold. After the concrete for the pipe body reaches the strength requirement, release the internal Locking of the mold, take out the prefabricated inner formwork of each segment from top to bottom, and complete the construction of the underwater pouring pipe column with retaining wall;

e. A top cover is poured on the top surface of the underwater pouring column with retaining walls to complete the construction of the foundation cap.

The feature of construction method of the present invention also is:

The prefabricated inner formwork of each section is set as a hollow buoy structure, and after the locking of the inner formwork is released, the inner formwork of each section can be recovered by floating up by relying on buoyancy.

The upper section of the bottom section formwork is a cylindrical cylinder, and the lower section is a conical cylinder. The bottom section formwork is positioned by pouring its conical cylinder bottom into the concrete back cover of the pipe column hole.

The prefabricated inner formwork of each section is assembled from tile formwork; in the prefabricated inner formwork of each section, the horizontally arranged "ten" support frame is at the four support positions of "ten". There are positioning columns on the upper support, and each tile formwork is interlocked with the positioning columns on the adjacent positions, and can slide vertically with the positioning columns as the guide column; between the prefabricated inner formworks of adjacent segments, the corresponding position The positioning columns are screwed to each other; the positioning columns in the prefabricated inner formwork of the first section at the position adjacent to the bottom section formwork are screwed on the top surface of the bottom section formwork, and each section A locking steel hinge line for tension runs through the prefabricated inner templates of the sections; the locking steel hinge line is tensioned on the hole top limit platform by a jack.

In the center of each "ten" supporting frame, steel strand tie nodes are respectively arranged, and recycled steel strands are connected in series between the steel strand tie nodes and extend to the orifice of the pipe column hole. To recycle the "ten" character support frame.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

1. The retaining wall layer in the present invention has higher strength-to-mass ratio, stiffness-to-mass ratio, good corrosion resistance, and good anti-seepage performance. It can be used as a concrete protective shell to protect the concrete structure for a full life;

2. The retaining wall layer in the present invention can better restrain the longitudinal and circumferential strains of the pipe string, and the reinforcement skeleton can be configured according to the minimum reinforcement ratio, which is greatly reduced compared with ordinary reinforced concrete immersed pipes. The formwork in each section Repeated use saves the cost, and the amount used also reduces the hoisting weight of the steel frame.

3. Compared with concrete prefabricated immersed pipes, the collocation of retaining wall layer and inner mold in the present invention realizes pipe column cast-in-place, which solves the problem of difficult transportation of prefabricated large-diameter immersed pipes on site, greatly improves construction efficiency and shortens construction period;

4. In the prior art, it is difficult to handle the joint height of the prefabricated parts, and the quality is not easy to control. The invention realizes the one-time pouring of the pipe column foundation, and the foundation is a complete whole, which can effectively improve the mechanical properties of the foundation and the quality of the foundation is reliable;

5. In the prefabricated sinking method in the prior art, grouting treatment is required after the prefabricated parts sink, and the grouting process is complicated, especially for the quality of the grouting at the bottom of the pipe column foundation, which is difficult to control, resulting in loosening of the periphery of the bottom of the foundation, making the foundation load-bearing The force is reduced, and the invention realizes one-time cast-in-place without grouting treatment. Moreover, the present invention adopts a steel structure conical bottom section formwork, which can be extended to a relatively deep place, and then the pouring is completed. Because the poured concrete has strong fluidity, it can be squeezed into each space, and there will be no bottom periphery that may be caused by traditional construction methods. loose question.

Description of drawings

Fig. 1 is the elevation view of self-floating internal mold system of the present invention;

Fig. 2 is a plan view of the self-floating internal mold system of the present invention;

Fig. 3 is the schematic diagram of the installation of the bottom section positioning formwork of the present invention;

Figure 4 is a schematic diagram of the installation of the second section of the column and the cross support frame in the present invention;

Figure 5 is a schematic diagram of the connection between the self-floating formwork and the positioning column in the present invention;

Fig. 6 is a schematic diagram of the connection between the cross support frame and the positioning column in the present invention;

Fig. 7 is a schematic diagram of the elevation of the column of the present invention;

Fig. 8 is a schematic plan view of the column of the present invention;

Fig. 9 is a schematic diagram of the structure of the pipe column of the present invention after pouring is completed.

Numbers in the figure: 1 retaining wall layer, 2 reinforcement cage, 3 inner formwork, 3a stiffening plate, 4 bottom section formwork, 5 is "ten" support frame, 5a tapered pin, 6 positioning column, 6a supporting corbel, 7 lock Tight steel hinges, 8 holes top limit platform, 9 jacks, 10 steel strands tie joints, 11 concrete bottom cover, 12 steel strands for recycling, 13 threading holes, 14 pipe body concrete.

Detailed ways

Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in the present embodiment, the structural form of the internal formwork system for constructing the underwater pouring column with retaining wall is:

As shown in Figure 1, it includes a steel structure bottom section formwork 4, on the bottom section formwork 4, each section prefabricated inner formwork 3 is assembled section by section from bottom to top; each section prefabricated inner formwork 3 can obtain buoyancy in water The fully enclosed steel structure hollow buoy structure, after releasing the locking of the inner formwork, the inner formwork 3 of each segment can be recovered by floating up by buoyancy; the bottom section formwork 4 is poured in the concrete bottom cover 11 of the column hole for positioning.

As shown in Figure 2 and Figure 5, the prefabricated inner formwork 3 of each section is assembled from tile formwork; in the prefabricated inner formwork 3 of each section, the "ten" character support frame 5 arranged horizontally is in the shape of " Positioning columns 6 are supported on the four supporting positions of the “ten” character, and each tile formwork is interlocked with the positioning columns 6 at adjacent positions, and can slide vertically with the positioning column 6 as a guide column; each tile formwork is hollow The fully enclosed floating formwork is provided with various stiffening plates 3a inside; the prefabricated inner formwork 3 of each segment can be 6-15m according to the actual construction conditions.

As shown in Figure 3, Figure 4 and Figure 5, between the prefabricated inner formwork 3 of adjacent segments, the positioning columns 6 at the corresponding positions are screwed to each other; The positioning column in the segmental prefabricated inner formwork is screwed on the top surface of the bottom section formwork 4, and the prefabricated inner formwork 3 of each segment passes through the threading hole 13 provided in the prefabricated inner formwork 3 for tensioning. Locking the steel hinge line 7; the locking steel hinge line 7 is tensioned by jack 9 on the hole top limit platform 8.

In specific implementation, the upper section of the bottom section formwork 4 is a cylindrical cylinder, and the lower section is a conical cylinder, and the bottom section formwork 4 is positioned in the concrete bottom cover 11 of the pipe column hole by pouring its conical cylinder bottom;

As shown in Figure 6, the "ten" support frame 5 is set according to the stress situation, and each positioning column 6 is provided with at least two "ten" support frames 5, and the center of each "ten" support frame 5 is respectively Steel strand tie nodes 10 are provided, and steel strand tie wires 12 for recycling are connected in series between each steel strand tie tie nodes 10 and extend to the orifice for recovery of the "ten" support frame 5. A support bracket 6a is arranged on the inner side wall of the column 6, and the "ten" support frame 5 is connected to the support bracket 6a through a tapered pin 5a.

Referring to Fig. 7, Fig. 8 and Fig. 9, the structural form of the underwater pouring pipe column with retaining wall in this embodiment is formed by pouring underwater quick-setting materials between the cast-in-place reinforced concrete pipe column and the inner wall of the hole. There is a retaining wall layer 1, and the pipe column forms a concrete back cover 11 with a cast-in-place concrete bottom plate.

In this embodiment, the construction method of the underwater pouring type pipe string with retaining wall is carried out as follows:

1. At the position where the pipe string is set, use a drilling rig to construct a hole;

2. Utilize the annular sliding form device in the hole forming to pour the retaining wall layer (1) with underwater quick-setting material along the inner wall of the hole from bottom to top to form a retaining wall hole, and lower the cylindrical reinforcement cage into the retaining wall hole ( 2);

3. Lower the bottom section formwork (4) in the cylinder of the steel cage (2), assemble the bottom section formwork (4) section by section from bottom to top, and lower each section to prefabricate the inner formwork through the external counterweight (3) form the inner formwork, after locking the inner formwork, pour base concrete in the retaining wall hole to form a concrete back cover (11), and the bottom section formwork (4) is poured in the concrete back cover (11) of the pipe column hole for positioning, so as to form a retaining wall hole It is formed as a bottom-covered annular cylinder; the specific implementation is to install the positioning column and the "ten "Word support frame; when the top of the positioning column in the prefabricated formwork of the first section is at the hole position again, connect the positioning column and the "ten" support frame in the prefabricated formwork of the previous section with threads; continue to lower The positioning column and the "ten" support frame in the prefabricated formwork of each segment, when the external counterweight is used to sink each tile formwork in the prefabricated formwork of each segment from the opening to the designated position along the positioning column 6, the The locking steel strand 7 running through the threading hole 13 on the prefabricated inner formwork 3 of each segment is compacted and locked by jacks 9 on the hole top limiting platform 8 to complete the installation of the inner formwork.

4. In the bottom-covered annular cylinder, use the retaining layer 1 as the outer mold, pour the pipe body concrete 14 between the outer mold and the inner mold, and release the locking of the inner mold after the pipe body concrete 14 reaches the strength requirement, Take out the prefabricated inner formwork 3 of each segment from top to bottom, and complete the construction of the underwater pouring pipe column with retaining wall;

5. The top cover is poured on the top surface of the underwater pouring column with retaining wall to complete the construction of the foundation cap.

In the specific implementation, the underwater quick-setting material is mixed with cement, gypsum, HPMC material and water according to the mass ratio of 1:1:0.01:0.5, which can be adjusted appropriately according to the actual working conditions such as pouring height. The quick-setting material The solidification time is 1 hour, the strength is 2 MPa, and the thickness of the protective wall layer 1 formed by pouring is 5 to 20 cm.

The pouring process of the annular sliding form device is to move the movable formwork to the next position to continue pouring after the strength of the pouring material at the initial position reaches the allowable value, so as to realize continuous pouring. The sliding movable formwork in the annular sliding form device is ring-shaped. This construction The process has been widely used in engineering construction.

The length of the inner formwork 3 of a single section is 6-15 meters, and the prefabricated inner formwork 3 of each section is set as a hollow buoy structure. After the locking of the inner formwork is released, the inner formwork 3 of each section can be recovered by floating up by buoyancy. Use, save cost, save construction period; the conical bottom section formwork 4 of steel structure is pressed into the deep position at the bottom of the hole, which can effectively fix and position the inner formwork.

The diameter of the pipe column of the present invention is 3 to 6m, which can be widely used in engineering construction fields such as bridge building construction and hydraulic structure, and can be applied to the construction of conventional foundations on land, such as caissons and pipe strings; it is especially suitable for foundations in water Construction, such as bridge tower foundation, anchorage foundation in water, group well foundation, etc. Measures to increase friction can also be implemented on the basis of this structure, such as pushing into root keys to form a root foundation, etc.

Claims (6)

1. a kind of underwater pouring type pipe string with retaining wall, it is characterized in that: described pipe string is to adopt underwater quick-setting material pouring to form retaining wall layer ( 1), the pipe column forms a concrete back cover (11) with a cast-in-place concrete bottom plate. 2. The construction method of the underwater pouring type pipe column with retaining wall as claimed in claim 1, is characterized in that it is carried out as follows: a. At the position where the pipe string is set, use a drilling rig to construct a hole; B. Utilize the ring-shaped sliding form device in the described hole from bottom to top to pour the retaining wall layer (1) with the underwater quick-setting material along the inner wall of the hole to form the retaining wall hole, and lower the cylindrical reinforcement cage in the described retaining wall hole ( 2); c. Lower the bottom section formwork (4) in the tube of the steel cage (2), assemble the bottom section formwork (4) section by section from bottom to top, and lower each section to prefabricate the inner formwork through the external counterweight (3) form the inner formwork, after locking the inner formwork, pour base concrete in the retaining wall hole to form a concrete back cover (11), and the bottom section formwork (4) is poured in the concrete back cover (11) of the pipe column hole for positioning, so as to form a retaining wall hole an annular cylinder formed as a bottom cover; d. In the annular cylinder with the bottom cover, use the retaining wall layer (1) as an outer mold, pour concrete (14) between the outer mold and the inner mold, and pour the concrete (14) between the outer mold and the inner mold. ) after reaching the strength requirement, release the locking of the inner formwork, take out the prefabricated inner formwork (3) of each segment from top to bottom, and complete the construction of the underwater pouring pipe column with retaining wall; e. A top cover is poured on the top surface of the underwater pouring column with retaining walls to complete the construction of the foundation cap. 3. The construction method according to claim 2, characterized in that: the prefabricated inner formwork (3) of each section is set to be a hollow buoy structure, and after the locking of the inner mold is released, the inner formwork (3) of each section Recycling can be achieved by relying on buoyancy to float up. 4. The construction method according to claim 2, characterized in that: the upper section of the bottom section formwork (4) is a cylindrical cylinder, the lower section is a conical cylinder, and the bottom section formwork (4) is based on its The conical tube bottom is poured in the concrete bottom cover (11) of the pipe column hole for positioning. 5. The construction method according to claim 2, characterized in that: the prefabricated inner formwork (3) of each section is assembled from tile formwork; in the prefabricated inner formwork (3) of each section, The horizontally arranged "ten" support frame (5) supports positioning columns (6) on its four support positions in the shape of a "ten", and each tile template and the positioning column (6) on the adjacent position are locked together. embedded, and can slide vertically with the positioning column (6) as the guide column; between the prefabricated inner templates (3) of adjacent segments, the positioning column (6) on the corresponding position is screwed to each other; The positioning column in the first section prefabricated inner formwork on the adjacent position of the bottom section formwork (4) is screwed on the top surface of the bottom section formwork (4), and the prefabricated inner formwork in each section (3) run through the locking steel hinge line (7) used for tensioning; the locking steel hinge line (7) is tensioned by jacks (9) on the hole top limit platform (8). 6. The construction method according to claim 5, characterized in that: steel strand tie nodes (10) are respectively arranged at the center of each "ten" support frame (5), and there are steel strands for recycling (12) Connect in series between each steel strand tie node (10) and extend to the orifice of the pipe column hole, for recovering the "ten" support frame (5).