Zhao Ran looked at the huge sand table and couldn't help but praise: "Sun Zhenren is really rigorous, and the preliminary preparations are very sufficient. ”

Sun Biyun proudly twisted his long beard: "Such a huge work, are you not ready to succeed?" Since I received the idea of the Zhiran Flying Talisman at the beginning of the year, I asked the four seas and the nine directions to take turns to survey the landform, and I myself flew over the multiplier many times from above, so I had this sand table. ”

Zhao Ran said: "Sun Zhenren and the predecessors of the four seas and the nine directions have come to Yingtian many times?

Sun Biyun said with a smile: "Didn't you never start? I asked them not to go to you deliberately, so as not to delay you from doing other things." ”

Zhao Ran said: "The juniors are almost ready in Yingtian now, and the riverbank has also been cleared out, so you can start." Sun Zhenren, let's identify a few important links today. ”

Sun Biyun nodded, and instructed the old Taoist on the left: "Sihai, tell you Uncle Zhiran about the location problem." ”

The old Tao on his right hand answered: "Yes, Master." ”

Picked up the bamboo stick, pointed to the sand table and said: "The span of the bridge is very large, the requirements for the bridge foundation are very high, I and Jiufang have entered the water many times to explore, in addition to the section from Longjiang Pass to Pukou City proposed by Uncle Zhao, the upstream Qingliang Mountain North Sandbar, the downstream Yanziji, also suitable for building bridges, the foundation is solid, not easy to sink." ”

Zhao Ran looked at the sandbar and swallow rock pointed by Fu Sihai and began to think.

Fu Sihai continued: "The advantage of building a bridge at the sandbar is that it can be segmented, and the sandbar is the main pier base point in the middle, so there is no need for the whole underwater operation, and it is easy to adjust if there is a problem in the construction." The disadvantage is that the river is wider, 118 zhang wider than the Longjiang Pass, and the sandbar needs to be reinforced, and the amount of man-hours is much larger. ”

"The middle section of the Longjiang Pass, the river surface is 480 zhang, and the foundation is also strong enough, which is also the earliest site for building a bridge proposed by Uncle Zhao, which is indeed a more suitable place. ”

"The river surface at Yanziji downstream is narrower, 420 zhang, and the amount of man-hours is less. The disadvantage is that the water flow is rapid, and the difficulty of erecting the pier is relatively large. But as long as the pier is erected, the cost will be much less. ”

Zhao Ran shook his head and said, "It is faster and cheaper to build a bridge at Yanziji, but there is also a biggest problem, it is nearly four miles away from the city. If you want to cross the river, you must go down the river for four miles after leaving the city, which is not very convenient compared with the upstream sandbar and Longjiang Pass. ”

Sun Biyun thought for a while and said, "Well, it makes sense, for monks, four miles of land is nothing, but for ordinary people, it is a little inconvenient." The remaining two places, do you think it's better to go to the sandbank, or is it better to pass the Longjiang River?"

Zhao Ran stared at the two lots and kept weighing them, and wanted to choose the sandbar several times, but finally said: "Longjiang Pass." ”

If you choose Shazhou, Wang Zongyi and Liang Youhe, as well as many officials and dignitaries, will come to find themselves desperately. This is secondary, and the point is that since the "once" bridge appeared in that place, it must have a reason to appear there.

This is the first time Zhao Ran has engaged in such a large, high-tech project, and he doesn't want to make extraneous branches.

Sun Biyun agreed, and the three sites selected by their master and apprentice all met the foundation requirements for building the bridge, and as for which one to choose, of course, it was decided by the proposer and funder of the bridge.

Now that the site of the bridge has been determined, the question immediately is: how high should the bridge be built?

According to Sun Biyun's apprentice's measurement of the height of the riverbank, the bridge should be eight zhang higher than the river level, so as to ensure the passage of 800 large ships. And 800 materials are almost the largest ships that pass through the upper reaches of Yingtian.

The meaning of material is wood, and the wood used for shipbuilding is usually two zhang, which can carry 300 catties of goods when placed in water. A few of these logs were used, and that was a few boats.

The height of the main mast of the 800-material ship, that is, the use of 800 pieces of wood, is nearly six zhang high, plus the height of the hull, the bridge is eight zhang higher before it can be passed.

As for the thousands of materials or more, they are all sea boats, and they do not drive on the river, at most they are running down to the mouth of the river, so the bridge height set by Sun Biyun is eight zhang.

Zhao Ran originally wanted to make a thousand-year plan to ensure that the ship could be navigated by 2,000 materials, but with the construction method of the lucky boat, the mast height of the ship is generally 49/50 of the captain, which is almost the same as the captain, which means that the bridge must be more than 20 zhang above the water, which is equivalent to the height of three Yingtian city walls, such a project is too exaggerated to afford.

After a few struggles, Zhao Ran gave up his idea, eight hundred materials will be eight hundred materials, but in the future, he can make a fuss on the mast and strive to reduce the passage height of the main mast.

The height is determined, which means that the shape of the pier is determined - the lower width is narrow and the upper is narrow, the bottom is three zhang, the top is square, and the height is twenty zhang!

Among them, the big pier is eight zhang above the water surface, three zhang in the water, and nine zhang of the deep well underwater. This is a whole pier, to dig a deep well of nine zhang at the bottom of the river, and bury nearly half of the pier into the deep well, so that it can stand and stand firm.

Such a majestic bridge pier must be able to withstand the impact of the river for many years, and must be able to bear the huge weight of the bridge deck above, which is the most difficult place to build the Tianfu Bridge.

Few people in Daomen would have such ambitious ideas like Zhao Ran, and no one had the determination and financial resources to accomplish such a feat like him, so until today, no one has done such a big project.

Fortunately, Wudang has the Great Sage Nanyan Palace, and Sun Biyun's master and apprentice, which can make Zhao Ran's idea have hope of being realized.

Sun Biyun said: "I and the four seas and the nine parties at the same time refining the pier magic weapon, three in a month, fifteen main piers, five months can be completed." ”

Zhao Ran expressed his satisfaction, such efficiency is too high, and he can't ask for more. Fifteen piers, 35 zhang for a navigable bridge hole, this is the design of the main bridge on the river.

"Thirty-eight approach piers are also needed, ranging from one zhang high to nineteen zhang high, and they must be built first. Zhao Ran reminded.

"The approach pier is not complicated, there is no requirement to withstand the impact and corrosion of the water flow, it is very easy, and it can be refined in five or six months. The only problem is that there are not enough refining materials. ”

Fifty-three huge bridge piers are no less than refining fifty-three majestic palaces, and the spiritual material spirit ore required is a number that cannot bear to look at, Fu Jiufang handed over the list, and when Zhao Ran looked at it, his eyes immediately turned black.

10,000 catties of pure gold, 60,000 catties of Mithril, 300,000 catties of purple cloud copper, and 8,300,000 catties of refined iron......

30,000 catties of Guiyuan soil, 7,000 catties of mica stone, 18,000 catties of golden sand, 100,000 catties of rune stone......

Zhao Ran held this list, his face was more ugly than crying: "Sun Zhenren, there is definitely no way to get this." ”