CN-118166753-B - Pile plate type retaining wall high-altitude crown beam construction method

Abstract

The invention discloses a pile plate type retaining wall high-altitude crown beam construction method which comprises the following steps of S1, finishing preparation of templates and support members, S2, measuring and lofting, and S3, supporting system installation, wherein the supporting system installation step comprises support installation, I-steel and adjustable diagonal bracing installation, bottom die primary and secondary beam installation and bottom die installation, the support is installed on a retaining plate of the pile plate type retaining wall, a main beam is connected with the support through the adjustable diagonal bracing, leveling is carried out by adopting a steel wedge block, and finally, small beams and bottom templates are paved to realize crown beam construction.

Inventors

• YANG CHANGCAN
• ZHANG CAO
• PENG DAWEI
• HU QIANG
• WANG CHENGJUN
• LIU SHIGUO
• YE SHENGZHI

Assignees

• 中国五冶集团有限公司

Dates

Publication Date

20260512

Application Date

20240321

Claims (1)

1. 1. The pile plate type retaining wall high-altitude crown beam construction method is characterized by comprising the following steps of: S1, a construction preparation step, namely finishing preparation of each template and bracket component; S2, measuring and lofting, namely measuring and lofting on the retaining wall according to a template support design drawing; s3, installing a supporting system, comprising the steps of installing a support, installing I-steel and adjustable diagonal braces, installing a primary and secondary beam of a bottom die and installing the bottom die, Installing a support on a soil retaining plate of a pile plate type retaining wall, connecting a main beam with the support through an adjustable diagonal brace, leveling by adopting a steel wedge block, and finally paving a trabecula and a bottom template to realize crown beam construction; step S1, before the crown beam construction, detecting the concrete strength of the pile body and the retaining plate of the pile plate type retaining wall so as to ensure that the structure is qualified; Step S2, arranging special persons to take charge of site construction measurement, and checking the positions of the embedded parts to ensure that the positions of the embedded parts are accurate; Step S3 comprises an embedded part installation step, wherein the embedded part comprises a support embedded part and an I-steel embedded part, The support bolts adopt PVC pipes as embedded parts, the embedded positions are determined according to the crown beam elevation and the support system design drawing, the PVC pipes are fixed on wall steel bar meshes by adopting binding and welding positioning ribs, the upward floating deflection during concrete pouring is prevented, the range of 20cm around the PVC sleeve is reinforced by adopting phi 16 steel bar meshes; The I-steel embedded part adopts a wood template to manufacture a rectangular wood box, and is fixed on a wall steel bar net through welding a cross positioning rib, and the top elevation of the wood box is level with the bottom elevation of the crown beam; In the step S3, the support is formed by welding a customized steel plate and a hinged support lug plate, a round hole is formed on the lug plate as a pin mounting position, When the support is installed, 4 bolts are used for fixing the steel plates on the wall body between piles, the horizontal and vertical positions of the steel plates are adjusted, the support clings to the wall body, and the stress uniformity of each bolt is ensured; In the step S3, in the installation process of the I-steel and the adjustable diagonal braces, the length and arrangement space of the I-steel are determined according to the size of the crown beam, a hinged support is welded below the I-steel, the overhanging lengths of the I-steel on two sides of a pile plate wall are consistent and fixed during installation, the I-steel and the support are connected through the adjustable diagonal braces, and the positions of the hinged support are connected through steel pin shafts and are adjusted in level and elevation.

Description

Pile plate type retaining wall high-altitude crown beam construction method Technical Field The invention belongs to the technical field of building construction, and particularly relates to a pile plate type retaining wall high-altitude crown beam construction method. Background Along with the rapid development of the construction and municipal engineering industries in China, pile-plate type retaining walls are also more and more common as retaining structures. The pile-plate retaining wall is suitable for excavating soil and stones and can endanger side slopes of adjacent buildings or environmental safety, fill side slope retaining and engineering landslide control. The main structure of the reinforced concrete pile is composed of reinforced concrete piles and reinforced concrete baffles, wherein part of pile plate walls are provided with crown beams at the tops of the piles, the reinforced concrete piles are generally divided into rectangular and circular, and the baffles are divided into cast-in-situ plates and precast plates according to different processes. The crown beam is a reinforced concrete continuous beam arranged at the top of a supporting structure (most piles and walls) at the periphery of the foundation pit, and has the functions of connecting all pile foundations together and bearing horizontal load transferred by the foundation pit support, so that integral stress is formed, and collapse of the edge of the top of the foundation pit is prevented. The conventional support pile crown beam is used for excavating a groove along the support pile position in the ground construction, and the crown beam construction is directly carried out after the pile head treatment is finished, so that the method is obviously not applicable to the pile plate type retaining wall crown beam. And most of pile-plate (square pile) retaining wall crown beam construction is performed after the back of the wall is backfilled to the elevation of the crown beam bottom, and the pile-plate wall after the back of the wall is backfilled is arranged below the crown beam, so that the crown beam construction is directly performed. The pile plate type (round pile) retaining wall is formed by cast-in-situ and centered arrangement of the retaining plate due to the shape of the pile body, so that wider empty faces can be formed on two sides of the retaining plate, and crown beam template supports are required to be erected. The construction method of the pile plate type (round pile) retaining wall high-altitude crown beam is particularly important because the pile plate type (round pile) retaining wall crown beam has large section size and high height, and is economical and applicable. In the prior art, the full framing method comprises the specific construction processes of construction preparation, foundation treatment, full framing erection, bottom die installation, full framing prepressing, bottom die elevation adjustment, steel bar installation, side die installation and reinforcement, concrete pouring, side die plate dismantling and maintenance and bracket dismantling. The construction method can realize integral continuous pouring, does not need to dismantle and move the bracket, can avoid construction interruption caused by dismantling and moving the bracket, and improves construction efficiency. But the method has the defects that 1, the full framing is large in deformation under the action of load, the material consumption is large, the working amount of civilized construction management is large, 2, the full framing occupies a large area and is required to meet the requirement that the height-width ratio is not more than 3, and the economy and the applicability of building the full framing body on one side are not high for pile plate type (round pile) retaining wall crown beams with high heights. 3. The full framing has high requirement on the bearing capacity of the foundation, the foundation and the frame body are required to be pre-pressed, and the whole process time is longer than the pre-pressing construction period. In the prior art, a steel bar penetrating method comprises the specific construction processes of construction preparation, sleeve embedding of pile body (pier column), steel bar installation, balance box installation, main beam adjusting device installation, longitudinal main beam installation, transverse distribution beam installation, bottom die installation, reinforcing steel bar installation, side die installation, reinforcement, concrete pouring, concrete maintenance and bracket dismantling. The steel bar method does not occupy the ground and has no requirement on the foundation, is easy for civilized construction management, can bear larger load, and has small deformation of the bracket under the load. However, the steel bar method has the advantages that the size of the reserved hole is large, the pile plate type (round pile) retaining wall pile body steel bars are dense and collide with the p