CN215405915U

CN215405915U - Dam surface hole connection girder supporting structure

Info

Publication number: CN215405915U
Application number: CN202121705678.1U
Authority: CN
Inventors: 乔雨; 牟荣峰; 杨宁; 李率鸣; 李果; 晁燕安; 林星; 谭鹏
Original assignee: China Three Gorges Construction Engineering Co Ltd
Current assignee: China Three Gorges Construction Engineering Co Ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2022-01-04
Anticipated expiration: 2031-07-26

Abstract

The utility model discloses a dam surface hole connecting girder supporting structure.A plurality of parallel precast concrete beams are arranged between the top sides of every two adjacent surface hole gate piers, and a groove formed by combining every two adjacent precast concrete beams is used for pouring concrete; compared with the original method that a bottom template is erected at the top of the surface hole gate pier to form a bottom supporting structure by pouring, the method has the advantages that a plurality of prefabricated concrete beams are directly hoisted to be assembled into a plurality of grooves, concrete is directly poured into the grooves, a whole flat plate supporting structure is formed after forming, the steps of template presetting and dismantling are completely omitted, the prefabrication process of the prefabricated concrete beams can be completely and directly carried out on the ground in advance, the time is greatly shortened, the pouring construction process of subsequent connection of girders can be accelerated, the construction efficiency of the surface hole connection girders is improved, and the construction potential safety hazard is reduced.

Description

Dam surface hole connection girder supporting structure

Technical Field

The utility model relates to the technical field of dam concrete construction of hydroelectric engineering, in particular to a dam surface hole connection girder supporting structure.

Background

The dam in the hydroelectric junction project is the most important water retaining building, and the concrete dam is generally provided with a certain number of surface holes at the riverbed dam section so as to facilitate flood discharge in the flood season and ensure normal operation of the construction of the junction project. The surface hole structure of the dam is complex, the construction difficulty is large, the dam has the capacity of coping with flood control and flood fighting after the construction of the middle hole, so the construction progress is tense, the surface hole connecting crossbeam is the most critical link in the first line construction of the surface hole and is an arc door support-twisted stress structure, the construction quality requirement is high, the construction of the part occupies a straight construction period, the progress pressure is large, the construction part four faces the air, and the safety risk is high. The existing surface hole connecting girder needs to prefabricate a template in advance at the top of the surface hole gate pier before pouring construction, then a bottom die of the surface hole connecting girder is poured and formed, the template needs to be dismantled after the completion, and the girder is connected to the bottom die to pour the construction process.

Disclosure of Invention

The utility model aims to overcome the defects and provide the supporting structure for the dam surface hole connecting girder, which can remove the steps of template presetting and dismantling in the construction of connecting the bottom die of the girder, improve the construction efficiency of the surface hole connecting girder and reduce the potential safety hazard of construction.

In order to solve the technical problems, the utility model adopts the technical scheme that: a dam surface hole connection girder supporting structure is characterized in that a plurality of parallel precast concrete beams are arranged between the top sides of every two adjacent surface hole gate piers, and a groove formed by combining every two adjacent precast concrete beams is used for pouring concrete.

Preferably, a bracket is arranged on the top side of the meter hole gate pier, and the end part of the precast concrete beam is erected on the upper surface of the bracket.

Preferably, the precast concrete beam located at the inner side has a T-shaped cross section.

Preferably, the cross section of the precast concrete beam located at the side is an L-shaped structure.

Preferably, geotextile is laid at the connecting position of every two adjacent precast concrete beams.

Preferably, the connecting position of every two adjacent precast concrete beams is a wedge-shaped structure.

Preferably, reinforcing bars are also pre-inserted between the upper sides of the end portions of the two precast concrete girders at each opposite side and tied to each other.

Preferably, the depth of the groove formed between every two adjacent precast concrete beams in combination is 1 to 1.5 m.

The utility model has the beneficial effects that:

1. compare in originally erecting the die block board at table hole gate pier top and pouring and form bottom sprag structure, this patent is direct to form a plurality of recesses through the equipment of many precast concrete roof beams of hoist and mount, directly pour the concrete in to the recess, form a monoblock flat plate support structure after the shaping, the step that the template was preset and was demolishd has been removed completely in the middle of this, and precast concrete roof beam's prefabrication process can go on directly on ground in advance completely, the time has been shortened greatly, can accelerate the pouring work progress of follow-up connection girder, the table hole connection girder efficiency of construction has been improved, construction potential safety hazard has been reduced.

2. The utility model can ensure that the dam can still ensure high-strength construction even after reaching the surface hole complex structure, form the surface hole connecting section as soon as possible, strive for more time for the installation of the support winch and the arc door, improve the construction efficiency and effectively shorten the construction period.

3. The precast beam is convenient to install, is free from being dismantled in the later period, greatly reduces the construction risk, has greater economic benefit, and powerfully ensures the safety of a construction site.

Drawings

FIG. 1 is a schematic structural view of a supporting structure of a dam surface hole connection girder;

FIG. 2 is an enlarged schematic view of the front side area of the dam face opening of FIG. 1;

FIG. 3 is a schematic view illustrating a structure in which a plurality of grooves are formed by combining a plurality of precast concrete beams;

fig. 4 is a schematic structural view of geotextiles laid between two adjacent precast concrete beams;

fig. 5 is a perspective view of a precast concrete beam located at an inner side;

fig. 6 is a perspective view illustrating a precast concrete beam located at one side;

fig. 7 is a perspective view illustrating a precast concrete beam located at the other side.

Detailed Description

The utility model is described in further detail below with reference to the figures and specific embodiments.

As shown in fig. 1 to 7, in the supporting structure of the surface hole connection girder of the dam, a plurality of precast concrete beams 2 parallel to each other are arranged between the top sides of every two adjacent surface hole gate piers 1, and a groove formed by combining every two adjacent precast concrete beams 2 is used for pouring concrete.

Preferably, a bracket 3 is arranged on the top side of the meter hole gate pier 1, and the end part of the precast concrete beam 2 is erected on the upper surface of the bracket 3. In this embodiment, the reinforcing steel bars are also preset in advance in the corbel 3, and the corbel can be synchronously poured and molded with the top of the surface hole gate pier 1 after the warehouse preparation is completed.

Preferably, the precast concrete girder 2 located at the inner side has a T-shaped structure in cross section.

Preferably, the precast concrete girder 2 located at the side has an L-shaped cross section.

As shown in the figure, in the assembling process, a single precast concrete beam 2 in a T-shaped structure is in two half groove structures, and can quickly form a groove structure after being assembled with an adjacent precast concrete beam 2 in the T-shaped structure, and compared with a groove body structure in a U-shaped structure, grooves formed by the precast concrete beams 2 in the T-shaped structure share a common edge, so that materials are greatly saved; and the cross section of the precast concrete beam 2 positioned at the side is of an L-shaped structure, so that the side can be folded.

Preferably, geotextile 4 is laid at the connecting position of every two adjacent precast concrete beams 2. After the design like this, can prevent to take place the problem of leaking thick liquid when concreting in the recess.

Preferably, the connecting position of every two adjacent precast concrete beams 2 is a wedge structure. Can lead to the bottom of recess to form the triangle-shaped recess after the design like this, the contact of two precast concrete roof beams 2 is compared in the plane contact inseparabler like this, also can fill geotechnological cloth 4 in the triangle-shaped recess moreover to form the shutoff, avoid taking place the problem of leaking the thick liquid.

Preferably, the two precast concrete girders 2 on each opposite side are also pre-inserted with reinforcing bars 5 between the upper sides of the ends thereof and bound to each other. This enables the precast concrete girders 2 between the plurality of meter hole gate piers 1 to be connected to each other, preventing lateral movement from occurring.

Preferably, the depth of the groove formed between every two adjacent precast concrete girders 2 in combination is 1-1.5 m. In this embodiment, the depth of the groove formed by combining every two adjacent precast concrete beams 2 is 1.2m, and the pouring height is 1.2m when the groove formed by combining a plurality of precast concrete beams 2 is subjected to a concrete pouring process.

In addition, the utility model also discloses a construction method of the dam surface hole connection girder supporting structure, which comprises the following steps:

step 1): the construction period of the precast concrete beam 2 is planned in advance, and the prefabrication quantity is determined according to the length of the gate pier and the width index of the connecting girder; in this embodiment, the construction period of the top bracket 3 and the precast concrete beam 2 of the surface-hole gate pier 1 needs to be planned in advance, and the precast work of the precast concrete beam 2 is started 23 days before the bracket 3 is constructed.

Step 2): the steel bars 5 are arranged inside the precast concrete beam 2, the steel bars 5 transversely extend out of the end part of the precast concrete beam 2 for a certain distance, the lifting lugs are pre-embedded in advance, and concrete pouring is carried out after the warehouse preparation is finished; in this embodiment, the reinforcing bars 5 are extended laterally by a distance 2/3 from the ends of the two precast concrete beams 2 on the opposite side, which is the distance between the ends of the precast concrete beams 2.

Step 3): removing the formwork for a period of time after the precast concrete beam 2 is poured, then roughening the surface into a rough surface by using a roughening gun, and maintaining for a period of time; in this embodiment, the precast concrete beam 2 is demolded 2 to 3 days after the completion of casting, and then the surface is roughened to a rough surface by a roughening gun, and covered with geotextile, and maintained by water for 28 days.

Step 4): before the top of the surface hole gate pier 1 is constructed to the position of the bracket 3, the position of the bracket 3 is preset with steel bars and is reserved, and then the steel bars and the top of the surface hole gate pier 1 are synchronously cast and molded;

step 5): carrying out the hoisting work of the precast concrete beams 2, wherein the precast concrete beams 2 with the T-shaped cross sections are distributed in the middle, and the precast concrete beams 2 with the L-shaped cross sections are positioned at the sides; in the embodiment, the age of the precast concrete beam is more than 28 days, the pouring of the top of the gate pier is completed for 7 days, the lofting is completed, and the hoisting operation of the rear expandable precast concrete beam can be completed, and the hoisting can be performed by using a cable crane.

Step 6): two ends of each precast concrete beam 2 are placed on a bracket 3 on the top side of the surface hole gate pier 1, each precast concrete beam 2 is placed in parallel side by side, after the hoisting is finished, old concrete on the surface is chiseled, and reinforcing steel bars 5 extending out of the upper sides of the end parts of the two opposite precast concrete beams 2 are bound together; in this embodiment, the protruding reinforcing bars 5 are bound to each other by steel wires.

Step 7): the method comprises the following steps that a concrete pouring process is carried out on grooves formed by combining a plurality of precast concrete beams 2, the height of poured concrete is the depth of the grooves, and the poured concrete is an integrated flat plate supporting structure and serves as a supporting bottom die for the subsequent connection girder pouring construction; in this embodiment, when concrete is cast into the grooves formed by combining the plurality of precast concrete beams 2 with each other, each groove is subjected to a casting process one by one.

Step 8): and (4) after the integral construction is finished, the girder can be connected to the flat plate supporting structure formed in the step (7) for pouring construction. In the subsequent connection girder pouring construction process, the first layer and the second layer of the prepared cabin are not too thick, generally controlled according to 1.5-2.0m, and the rise thickness can be properly increased in the subsequent process according to the requirement.

Preferably, the following steps are further included between step 6) and step 7): and the geotextile 4 is laid at the connecting position of the bottoms of every two adjacent precast concrete beams 2 to prevent the problem of slurry leakage when concrete is poured in the groove.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.

Claims

1. The utility model provides a girder bearing structure is connected to dam table hole which characterized in that: a plurality of precast concrete beams (2) which are parallel to each other are arranged between the top sides of every two adjacent surface hole gate piers (1), and a groove formed by combining every two adjacent precast concrete beams (2) is used for pouring concrete.

2. The dam face hole connection girder support structure of claim 1, wherein: top side of table hole gate pier (1) is equipped with bracket (3), and precast concrete beam (2) tip erects in bracket (3) upper surface.

3. The dam face hole connection girder support structure of claim 1, wherein: the cross section of the precast concrete beam (2) positioned on the inner side is of a T-shaped structure.

4. The dam face hole connection girder support structure of claim 1, wherein: the cross section of the precast concrete beam (2) positioned on the side is of an L-shaped structure.

5. The dam face hole connection girder support structure of claim 1, wherein: and geotextile (4) is laid at the connecting position of every two adjacent precast concrete beams (2).

6. The dam face hole connection girder support structure of claim 1, wherein: the connecting position of every two adjacent precast concrete beams (2) is of a wedge-shaped structure.

7. The dam face hole connection girder support structure of claim 1, wherein: and reinforcing steel bars (5) are also pre-inserted between the upper sides of the end parts of the two precast concrete beams (2) on each opposite side and are bound with each other.

8. The dam face hole connection girder support structure of claim 1, wherein: the depth of the groove formed by combining every two adjacent precast concrete beams (2) is 1-1.5 m.