After a hundred years without major repairs, do you know the secret of the "indestructible" of the back seawall?

A river, a sea, and a thousand-year-old city surrounded by mountains carry the tactful years and historical traces. This is a small coastal town that cannot be copied. Time is here to sing three sighs and breathe like orchid......
 

After the search seawall

Houhaitang is the most well-preserved ancient city wall near the urban area of Ningbo. Due to the development of the city, the once magnificent ancient city wall of Zhenhai was completely lost in the dust of history after its success. Only the north wall of the city and pond-the "Houhaitang" continues to exert its residual heat, quietly telling the vicissitudes of life in Zhenhai for thousands of years, and also placing our thoughts of pursuing the future with caution......

 

 

Houhaitang starts from the foothills of Jinzi Mountain in the east and ends at Yu Fan Jiaxie Pavilion in the west. The pond winds and stretches for a total length of 4.8 kilometers. The pond is 3 meters wide and 9.9 to 10.6 meters high. From a distance, the stone seawall is like a silver dragon leaning on the coast of the East China Sea, with extraordinary momentum and grandeur.

 

 

History of Houhai Seawall

After the seawall history can be traced back to the Tang Dynasty, Tang Yuan and four years (809 years), the imperial court in the shandong Yongjiang River mouth to build Wanghai town, for the town of the beginning of the construction of the sea. In the fourth year of Tang Ganning (897 A. D.), a soil pond was built to keep out the tide, but "there is often a danger of a dash", so in the 16th year of Song Chunxi (1189), the soil pond was changed to a stone pond, but it still couldn't withstand the impact of strong winds and waves, and collapsed many times.

 

 

In the 13th year of Emperor Qianlong of the Qing Dynasty (1748), Wang Mengbi, the magistrate of Zhenhai County, was in order to resist the invasion of the storm and implored the court to allocate funds to repair the pond. After extensive investigation and public opinion, Magistrate Wang thought that "single stone and thin soil can last forever", so he rebuilt 576.5 zhangs of interlayer stone pond at the top of Fengtao, 396 zhangs of stone pond at the secondary section, 51 zhangs of new stone pond and 810 zhangs of outer and outer walls of collapsed city in the north. He personally directed at the construction site. It took three years to change the old stone pond into a new stone pond, forming a huge barrier in the north of the city.

 

 

It has not been overhauled for nearly a hundred years. Until the tenth year of the Qing Dynasty (1830), it was repeatedly hit by hurricanes and waves, earth and rock broke, and had to be renovated, rebuilt and reinforced several times.

 

 

seawall technology

According to historical records, this reconstruction project is very large. It lasted 4 years and cost more than 80000 yuan. All the funds were allocated from the national treasury, which is equivalent to a national key defense project. The cedar wood used was cut in Fujian, the caulking lime was fired in Fuyang, the stone was mined in Yinjiang and Dayin in Yinci, and thousands of craftsmen were collected in Ningshao and Shaoxing. The stone alone has more than 80000 cubic meters, all of which are transported from hundreds of miles away.

 

 

The ancient seawall has scientific structure, exquisite workmanship and exquisite materials, which is of great research value in the history of Chinese seawall construction. Its construction technology is commonly known as sandwich stone pond, that is, from the foot of the pond to the top of the pond, 7 thick stones are buried horizontally and vertically, each of which is chiseled into a belt as a keel. Tongtang evenly arranged 7 belts, and then inserted into the 6-way mantle plate paved with large stone slabs to cross the vertical, and the mantle soil is the pond. The keel and keel, keel and the mantle plate are all embedded in a chisel-like manner, and a layer of lining board is added under it.

 

 

Stone and stone glue into thick ash, so that sea water can not enter the joint to pump soil. And the bottom rammed block stone, and nail the top pile, pond outside the beam closed stone row pile, pond mouth buckle back wave standing stone, embedded into a piece, its fastness through the test of history, a hundred years without loss.

 

 

"City and pond in one"

In order to prevent the waves from hitting the key part of the seawall and to prevent Japanese pirates from landing on the seawall, Wang Mengbi organized craftsmen to build a city wall on the stone pond from Jinzi Mountain to Wanghai Tower, with 12 "police shops" and 25 cannons, which not only prevented the waves from hitting and damaging the seawall, but also greatly strengthened the perfection of fortifications. The combination of "Xiatang and Shangcheng" was called "!

 

 

In the ancient seaside town, life is as calm and peaceful as flowing water. Houhaitang is still one of the favorite walking places for Zhenhai citizens to go after dinner. After a long and lonely time, the sea under the ancient pond has become a mulberry field, but the back sea pond is still like an indestructible sea and sky guard, guarding the sea and sky......

 

 

 

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