CN-122013775-A - Self-balancing method for wharf cast-in-situ breast wall concrete temperature field

CN122013775ACN 122013775 ACN122013775 ACN 122013775ACN-122013775-A

Abstract

The invention discloses a self-balancing method of a wharf cast-in-situ breast wall concrete temperature field, which comprises the following steps of S1, arranging a plurality of side wall lower water pipelines with lower water inlets and lower water outlets at the lower part of a side wall, S2, pouring concrete at the lower part of the side wall, S3, arranging a plurality of side wall upper water pipelines with upper water inlets and upper water outlets at the upper part of the side wall, S4, connecting the plurality of upper water inlets with a plurality of outlet pipes of a water separator after the concrete at the lower part of the side wall is initially set, connecting each upper water outlet with a corresponding lower water inlet, connecting the plurality of lower water outlets with a water return port of a water storage tank, connecting the outlet of the water storage tank with an inlet of the water separator through a water pump to form a plurality of cooling water circulation loops, S5, pouring concrete at the upper part of the side wall, starting the water pump, enabling cooling water to enter the cooling water circulation loops, absorbing hydration heat of new concrete at the side part, and realizing the bidirectional effect of 'upper heat dissipation and lower heating' on the wall.

Inventors

LIAO JINHE
LIN JINCAN
LIN WEIWEI
SHAO MENGSHENG
ZHENG HAIXIONG
ZHANG LIANGFA
YANG WEISHENG

Assignees

中交第三航务工程局有限公司

Dates

Publication Date: 20260512
Application Date: 20260109

Claims (4)

1. The self-balancing method of the cast-in-place breast wall concrete temperature field of the wharf is carried out after the bottom plate concrete of the breast wall is poured, and is characterized by comprising the following steps of: s1, arranging a plurality of rows of side wall lower water pipes at the bottom of the side wall along the width direction of the side wall between the distance from the bottom plate to the bottom plate of the side wall not less than 50cm and the distance from the top of the side wall lower part to the side wall not less than 50cm, and connecting each row of side wall lower water pipes in series in a serpentine manner to form a plurality of side wall lower water pipelines with a lower water inlet and a lower water outlet, arranging three layers of lower temperature monitoring points at the bottom of the side wall, wherein the three layers of lower temperature monitoring points are located at the position from the bottom plate to the top of the side wall at a distance of 5-10 cm, the height middle part of the bottom plate and the top distance from the bottom plate to the top of the bottom plate at a distance of 5-10 cm, each layer of lower temperature monitoring points comprises an inner lower temperature monitoring point and two surface lower temperature monitoring points, wherein the two surface lower temperature monitoring points are located at the position from the inner side surface of the bottom of the side wall lower part at a distance of 5-10 cm and the outer surface of the bottom of the side wall lower part at a distance of 5-10 cm; S2, pouring concrete at the lower part of the side wall; S3, arranging a plurality of rows of side wall upper water pipes which are in one-to-one correspondence with the plurality of rows of side wall lower water pipes at the side wall upper part of the breast wall along the width direction of the side wall, and connecting the side wall upper water pipes in series in a serpentine wiring mode to form a plurality of side wall upper water pipelines with an upper water inlet and an upper water outlet, arranging three layers of upper temperature monitoring points at the side wall upper part, wherein the three layers of upper temperature monitoring points are positioned at the interface between the side wall lower part and the side wall upper part in one-to-one correspondence, the height middle part of the side wall upper part and the top distance between the side wall upper part is 5-10 cm, each layer of upper temperature monitoring point comprises an inner upper temperature monitoring point and two surface upper temperature monitoring points, the inner upper temperature monitoring points are positioned at the thickness middle part of the side wall upper part in one-to-one correspondence with the inner surface distance between the side wall upper part and the outer surface of the side wall upper part is 5-10 cm, and the distance between the inner surface of the side wall upper part is 5-10 cm, and the temperature monitoring points are respectively connected with all the temperature sensors through the temperature sensors; S4, after the concrete at the lower part of the side wall is initially set, connecting the upper water inlets of the water pipelines at the upper part of the side walls with a plurality of outlet pipes of the water distributor in a one-to-one correspondence manner, installing a control valve and a flowmeter on each outlet pipe on the water distributor, connecting the upper water outlet of each water pipeline at the upper part of the side wall with the lower water inlet of the corresponding water pipeline at the lower part of the side wall, simultaneously connecting the lower water outlets of the water pipelines at the lower part of the side wall with the water return opening of the water storage tank, and connecting the outlet of the water storage tank with the inlet of the water distributor through a water pump to form a plurality of cooling water circulation loops; S5, pouring concrete on the upper part of the side wall, starting a water pump, opening control valves on a plurality of cooling water circulation loops, enabling cooling water in the water storage tank to enter the cooling water circulation loop from a water inlet on the upper part of a water pipeline on the side wall, and enabling the cooling water to flow back to the water storage tank from a water outlet on the lower part of the water pipeline on the lower part of the side wall after absorbing hydration heat of new concrete on the upper part of the side wall; s6, continuously introducing water to the cooling water circulation loops, and pouring roof concrete of the breast wall after initial setting of concrete at the upper part of the side wall; And S7, continuously introducing water to a plurality of cooling water circulation loops, monitoring the temperature difference between the lower part of the side wall and the upper part of the side wall in real time through three layers of lower temperature monitoring points and three layers of upper temperature monitoring points, simultaneously monitoring the temperature difference between the inside of the side wall and the surface part of the side wall, if the temperature difference of the concrete inner surface of the upper part of the side wall is 23 ℃, sending out early warning by a PLC (programmable logic controller) in advance by 2 ℃, increasing the rotating speed of a water pump, namely 10% -20% of lifting water flow, and simultaneously increasing the opening of all control valves on the water separator, and if the temperature difference between the lower part of the side wall and the upper part of the side wall is more than 8 ℃, slowing down the rotating speed of the water pump or reducing the opening of all the control valves on the water separator, reducing the flow rate of cooling water, and sounding an alarm when the temperature difference between the inner surface of the side wall is more than 25 ℃ or the temperature difference between the lower part of the side wall and the upper part of the side wall is more than 10 ℃.
2. The self-balancing method for the concrete temperature field of the wharf cast-in-situ breast wall of claim 1, wherein the horizontal spacing and the vertical spacing of the lower water pipe of the side wall and the upper water pipe of the side wall are both 0.5 to 1.5m.
3. The self-balancing method of the wharf cast-in-situ breast wall concrete temperature field according to claim 1 or 2, wherein the water pipes at the lower part of the side wall and the water pipes at the upper part of the side wall are fixed by adopting a steel bar bracket.
4. The self-balancing method for the wharf cast-in-situ breast wall concrete temperature field of claim 1, wherein a liquid level sensor is installed in the water storage tank at a position 1/3 of the height of the water storage tank, and a filter is installed between the outlet of the water storage tank and the inlet of the water pump.

Description

Self-balancing method for wharf cast-in-situ breast wall concrete temperature field Technical Field The invention relates to a self-balancing method of a wharf cast-in-situ breast wall concrete temperature field. Background Improving durability of water engineering infrastructure is a major concern in this field in China for a long time, wherein the durability of concrete is particularly remarkable, and particularly the situation that aggressive media penetrate and damage to concrete is caused by cracks is increasing. Cracks have become a critical issue in concrete durability research. With the development of the water transportation engineering to large-scale and offshore, the gravity wharf is widely applied, but the problem of cracking of breast wall concrete frequently occurs. Research shows that the cause of the crack relates to the quality of raw materials, construction control, mixing ratio, structural design and other aspects. The cracks not only affect the appearance of the concrete, but also accelerate the corrosion of the steel bars, endanger the safety of the whole structure, and possibly cause the damage and the function degradation of the concrete surface layer when serious. Therefore, the control of cracks is a precondition for ensuring the normal use of the concrete structure. The gravity type wharf breast wall concrete can shrink due to the asynchronous of new and old concrete and generate a large number of cracks due to constraint stress and temperature stress formed by temperature change in the step-by-step pouring process. So the temperature control of the concrete is the key point of crack control in the construction process. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a self-balancing method for a concrete temperature field of a wharf cast-in-situ breast wall, which can effectively reduce the comprehensive temperature difference between new and old concrete, adjust the elastic modulus difference of the upper and lower concrete of a side wall and reduce the influence of unsynchronized shrinkage and temperature stress of the concrete. The invention aims to realize the self-balancing method of the concrete temperature field of the wharf cast-in-situ breast wall, which is carried out after the bottom plate concrete of the breast wall is poured, and comprises the following steps of: s1, arranging a plurality of rows of side wall lower water pipes at the bottom of the side wall along the width direction of the side wall between the distance from the bottom plate to the bottom plate of the side wall not less than 50cm and the distance from the top of the side wall lower part to the side wall not less than 50cm, and connecting each row of side wall lower water pipes in series in a serpentine manner to form a plurality of side wall lower water pipelines with a lower water inlet and a lower water outlet, arranging three layers of lower temperature monitoring points at the bottom of the side wall, wherein the three layers of lower temperature monitoring points are located at the position from the bottom plate to the top of the side wall at a distance of 5-10 cm, the height middle part of the bottom plate and the top distance from the bottom plate to the top of the bottom plate at a distance of 5-10 cm, each layer of lower temperature monitoring points comprises an inner lower temperature monitoring point and two surface lower temperature monitoring points, wherein the two surface lower temperature monitoring points are located at the position from the inner side surface of the bottom of the side wall lower part at a distance of 5-10 cm and the outer surface of the bottom of the side wall lower part at a distance of 5-10 cm; S2, pouring concrete at the lower part of the side wall; S3, arranging a plurality of rows of side wall upper water pipes which are in one-to-one correspondence with the plurality of rows of side wall lower water pipes at the side wall upper part of the breast wall along the width direction of the side wall, and connecting the side wall upper water pipes in series in a serpentine wiring mode to form a plurality of side wall upper water pipelines with an upper water inlet and an upper water outlet, arranging three layers of upper temperature monitoring points at the side wall upper part, wherein the three layers of upper temperature monitoring points are positioned at the interface between the side wall lower part and the side wall upper part in one-to-one correspondence, the height middle part of the side wall upper part and the top distance between the side wall upper part is 5-10 cm, each layer of upper temperature monitoring point comprises an inner upper temperature monitoring point and two surface upper temperature monitoring points, the inner upper temperature monitoring points are positioned at the thickness middle part of the side wall upper part in one-to-one correspondence with the inner surface distance between the